[Keyboard] add chromatonemini keyboard (#13516)

20 files changed, 2560 insertions, 0 deletions

diff --git a/keyboards/bandominedoni/keymaps/led/config.h b/keyboards/bandominedoni/keymaps/led/config.h
new file mode 100644
index 0000000000..04bd66bf1a
--- /dev/null
+++ b/keyboards/bandominedoni/keymaps/led/config.h
@@ -0,0 +1,18 @@
+/* Copyright 2021 3araht
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+ #pragma once
+
+#define DYNAMIC_KEYMAP_LAYER_COUNT 6
diff --git a/keyboards/chromatonemini/chromatonemini.c b/keyboards/chromatonemini/chromatonemini.c
new file mode 100644
index 0000000000..91caab7980
--- /dev/null
+++ b/keyboards/chromatonemini/chromatonemini.c
@@ -0,0 +1,208 @@
+/* Copyright 2021 3araht
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "chromatonemini.h"
+
+#ifdef RGB_MATRIX_ENABLE
+#    define NO_LED 255
+
+led_config_t g_led_config = {
+    {
+#if 0
+        // register bottom two rows
+        { 0,   4,  3,  2,  1, 41,  5, NO_LED },
+        { 40,  6, 39,  7, 38,  8, 37, NO_LED },
+        {  9, 36, 10, 35, 11, 34, 12, NO_LED },
+        { 33, 13, 32, 14, 31, 15, 30, NO_LED },
+        { 16, 29, 17, 28, 18, 27, 19, NO_LED },
+        { 26, 20, 25, 21, 24, 22, 23, NO_LED }
+
+        // register middle two rows
+        { 0,   4,  3,  2,  1, 78, 42, NO_LED },
+        { 77, 43, 76, 44, 75, 45, 74, NO_LED },
+        { 46, 73, 47, 72, 48, 71, 49, NO_LED },
+        { 70, 50, 69, 51, 68, 52, 67, NO_LED },
+        { 53, 66, 54, 65, 55, 64, 56, NO_LED },
+        { 63, 57, 62, 58, 61, 59, 60, NO_LED }
+
+        // register top and bottom rows
+        { 0,     4,   3,   2,   1, 115,   5, NO_LED },
+        { 114,   6, 113,   7, 112,   8, 111, NO_LED },
+        { 9,   110,  10, 109,  11, 108,  12, NO_LED },
+        { 107,  13, 106,  14, 105,  15, 104, NO_LED },
+        {  16, 103,  17, 102,  18, 101,  19, NO_LED },
+        { 100,  20,  99,  21,  98,  22,  97, NO_LED }
+#else
+        // register top two rows
+        { 0,     4,   3,   2,   1, 115,  79, NO_LED },
+        { 114,  80, 113,  81, 112,  82, 111, NO_LED },
+        { 83,  110,  84, 109,  85, 108,  86, NO_LED },
+        { 107,  87, 106,  88, 105,  89, 104, NO_LED },
+        {  90, 103,  91, 102,  92, 101,  93, NO_LED },
+        { 100,  94,  99,  95,  98,  96,  97, NO_LED }
+#endif
+    },  {
+        { 14,  12 },
+        { 14,  36 },
+        { 19,  48 }, { 9, 48 },
+        { 14,  60 },
+        { 39,  60 }, { 49,  60 }, {  59, 60 }, {  69, 60 }, {  79, 60 }, {  89, 60 }, {  99, 60 }, { 109, 60 }, { 119, 60 }, { 129, 60 }, { 139, 60 }, { 149, 60 }, { 159, 60 }, { 169, 60 }, { 179, 60 }, { 189, 60 }, { 199, 60 }, { 209, 60 },
+        { 214, 48 }, { 204, 48 }, { 194, 48 }, { 184, 48 }, { 174, 48 }, { 164, 48 }, { 154, 48 }, { 144, 48 }, { 134, 48 }, { 124, 48 }, { 114, 48 }, { 104, 48 }, {  94, 48 }, {  84, 48 }, {  74, 48 }, {  64, 48 }, {  54, 48 }, {  44, 48 }, { 34, 48 },
+        { 39,  36 }, { 49,  36 }, {  59, 36 }, {  69, 36 }, {  79, 36 }, {  89, 36 }, {  99, 36 }, { 109, 36 }, { 119, 36 }, { 129, 36 }, { 139, 36 }, { 149, 36 }, { 159, 36 }, { 169, 36 }, { 179, 36 }, { 189, 36 }, { 199, 36 }, { 209, 36 },
+        { 214, 24 }, { 204, 24 }, { 194, 24 }, { 184, 24 }, { 174, 24 }, { 164, 24 }, { 154, 24 }, { 144, 24 }, { 134, 24 }, { 124, 24 }, { 114, 24 }, { 104, 24 }, {  94, 24 }, {  84, 24 }, {  74, 24 }, {  64, 24 }, {  54, 24 }, {  44, 24 }, { 34, 24 },
+        { 39,  12 }, { 49,  12 }, {  59, 12 }, {  69, 12 }, {  79, 12 }, {  89, 12 }, {  99, 12 }, { 109, 12 }, { 119, 12 }, { 129, 12 }, { 139, 12 }, { 149, 12 }, { 159, 12 }, { 169, 12 }, { 179, 12 }, { 189, 12 }, { 199, 12 }, { 209, 12 },
+        { 214,  0 }, { 204,  0 }, { 194,  0 }, { 184,  0 }, { 174,  0 }, { 164,  0 }, { 154,  0 }, { 144,  0 }, { 134,  0 }, { 124,  0 }, { 114,  0 }, { 104,  0 }, {  94,  0 }, {  84,  0 }, {  74,  0 }, {  64,  0} , {  54,  0 }, {  44,  0 }, { 34,  0 }
+    },  {
+        1,
+        4,
+        4, 4,
+        4,
+        4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+        4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+        4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+        4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+        4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+        4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4
+    }
+};
+
+// indicator
+const uint8_t led_scale_indicator[12][12] = {
+  {23, 29, 35, 41, 60, 66,  72,  78,  97, 103,    109,    115},     //  C
+  { 5, 11, 17, 42, 48, 54,  79,  85,  91, NO_LED, NO_LED, NO_LED},  //  C#
+  {28, 34, 40, 65, 71, 77, 102, 108, 114, NO_LED, NO_LED, NO_LED},  //  D
+  { 6, 12, 18, 43, 49, 55,  80,  86,  92, NO_LED, NO_LED, NO_LED},  //  D#
+  {27, 33, 39, 64, 70, 76, 101, 107, 113, NO_LED, NO_LED, NO_LED},  //  E
+  { 7, 13, 19, 44, 50, 56,  81,  87,  93, NO_LED, NO_LED, NO_LED},  //  F
+  {26, 32, 38, 63, 69, 75, 100, 106, 112, NO_LED, NO_LED, NO_LED},  //  F#
+  { 8, 14, 20, 45, 51, 57,  82,  88,  94, NO_LED, NO_LED, NO_LED},  //  G
+  {25, 31, 37, 62, 68, 74,  99, 105, 111, NO_LED, NO_LED, NO_LED},  //  G#
+  { 9, 15, 21, 46, 52, 58,  83,  89,  95, NO_LED, NO_LED, NO_LED},  //  A
+  {24, 30, 36, 61, 67, 73,  98, 104, 110, NO_LED, NO_LED, NO_LED},  //  A#
+  {10, 16, 22, 47, 53, 59,  84,  90,  96, NO_LED, NO_LED, NO_LED}   //  B
+};
+
+const uint8_t led_single_col_indicator[37][3] = {
+  {41, 78, 115},  //  K01  = C1
+  { 5, 42,  79},  //  K02  = C#1
+  {40, 77, 114},  //  K03  = D1
+  { 6, 43,  80},  //  K04  = D#1
+  {39, 76, 113},  //  K05  = E1
+  { 7, 44,  81},  //  K06  = F1
+  {38, 75, 112},  //  K07  = F#1
+  { 8, 45,  82},  //  K08  = G1
+  {37, 74, 111},  //  K09  = G#1
+  { 9, 46,  83},  //  K10  = A1
+  {36, 73, 110},  //  K11  = A#1
+  {10, 47,  84},  //  K12  = B1
+  {35, 72, 109},  //  K13  = C2
+  {11, 48,  85},  //  K14  = C#2
+  {34, 71, 108},  //  K15  = D2
+  {12, 49,  86},  //  K16  = D#2
+  {33, 70, 107},  //  K17  = E2
+  {13, 50,  87},  //  K18  = F2
+  {32, 69, 106},  //  K19  = F#2
+  {14, 51,  88},  //  K20  = G2
+  {31, 68, 105},  //  K21  = G#2
+  {15, 52,  89},  //  K22  = A2
+  {30, 67, 104},  //  K23  = A#2
+  {16, 53,  90},  //  K24  = B2
+  {29, 66, 103},  //  K25  = C3
+  {17, 54,  91},  //  K26  = C#3
+  {28, 65, 102},  //  K27  = D3
+  {18, 55,  92},  //  K28  = D#3
+  {27, 64, 101},  //  K29  = E3
+  {19, 56,  93},  //  K30  = F3
+  {26, 63, 100},  //  K31  = F#3
+  {20, 57,  94},  //  K32  = G3
+  {25, 62,  99},  //  K33  = G#3
+  {21, 58,  95},  //  K34  = A3
+  {24, 61,  98},  //  K35  = A#3
+  {22, 59,  96},  //  K36  = B3
+  {23, 60,  97}   //  K37  = C4
+};
+
+#endif  //  RGB_MATRIX_ENABLE
+
+uint8_t shift_led_indicator_left(uint8_t scale_indicator_col){
+    if (scale_indicator_col > 0) {
+        scale_indicator_col--;
+    } else {
+        scale_indicator_col = 11;
+    }
+    return scale_indicator_col;
+}
+
+uint8_t shift_led_indicator_right(uint8_t scale_indicator_col){
+    if (scale_indicator_col < 11) {
+        scale_indicator_col++;
+    } else {
+        scale_indicator_col = 0;
+    }
+    return scale_indicator_col;
+}
+
+#ifdef ENCODER_ENABLE
+#   ifdef ENCODERS
+static uint8_t  encoder_state[ENCODERS] = {0};
+static keypos_t encoder_cw[ENCODERS]    = ENCODERS_CW_KEY;
+static keypos_t encoder_ccw[ENCODERS]   = ENCODERS_CCW_KEY;
+#   endif
+
+void encoder_action_unregister(void) {
+#   ifdef ENCODERS
+    for (int index = 0; index < ENCODERS; ++index) {
+        if (encoder_state[index]) {
+            keyevent_t encoder_event = (keyevent_t) {
+                .key = encoder_state[index] >> 1 ? encoder_cw[index] : encoder_ccw[index],
+                .pressed = false,
+                .time = (timer_read() | 1)
+            };
+            encoder_state[index] = 0;
+            action_exec(encoder_event);
+        }
+    }
+#   endif
+}
+
+void encoder_action_register(uint8_t index, bool clockwise) {
+#   ifdef ENCODERS
+    keyevent_t encoder_event = (keyevent_t) {
+        .key = clockwise ? encoder_cw[index] : encoder_ccw[index],
+        .pressed = true,
+        .time = (timer_read() | 1)
+    };
+    encoder_state[index] = (clockwise ^ 1) | (clockwise << 1);
+#       ifdef CONSOLE_ENABLE
+    uprintf("encoder_action_register index = %u, clockwise = %u, row = %u, col = %u\n", index, clockwise, encoder_event.key.row, encoder_event.key.col);
+#       endif
+    action_exec(encoder_event);
+#   endif
+}
+
+void matrix_scan_kb(void) {
+    encoder_action_unregister();
+    matrix_scan_user();
+}
+
+bool encoder_update_kb(uint8_t index, bool clockwise) {
+    encoder_action_register(index, clockwise);
+    // don't return user actions, because they are in the keymap
+    // encoder_update_user(index, clockwise);
+    return true;
+};
+
+#endif
diff --git a/keyboards/chromatonemini/chromatonemini.h b/keyboards/chromatonemini/chromatonemini.h
new file mode 100644
index 0000000000..83838be73e
--- /dev/null
+++ b/keyboards/chromatonemini/chromatonemini.h
@@ -0,0 +1,122 @@
+/* Copyright 2021 3araht
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "quantum.h"
+
+/* This is a shortcut to help you visually see your layout.
+ *
+ * The first section contains all of the arguments representing the physical
+ * layout of the board and position of the keys.
+ *
+ * The second converts the arguments into a two-dimensional array which
+ * represents the switch matrix.
+ */
+#define LAYOUT( \
+        enc,       sustain,                  ccw, cw,                                                             \
+        up,                                                                                                       \
+    left, right,   k01, k03, k05, k07, k09, k11, k13, k15, k17, k19, k21, k23, k25, k27, k29, k31, k33, k35, k37, \
+        down,        k02, k04, k06, k08, k10, k12, k14, k16, k18, k20, k22, k24, k26, k28, k30, k32, k34, k36     \
+) { \
+    { enc, down, left, right, up,  k01, k02, sustain }, \
+    { k03, k04,  k05,  k06,   k07, k08, k09, ccw     }, \
+    { k10, k11,  k12,  k13,   k14, k15, k16, cw      }, \
+    { k17, k18,  k19,  k20,   k21, k22, k23, KC_NO   }, \
+    { k24, k25,  k26,  k27,   k28, k29, k30, KC_NO   }, \
+    { k31, k32,  k33,  k34,   k35, k36, k37, KC_NO   }  \
+}
+
+
+#ifdef RGB_MATRIX_ENABLE
+extern led_config_t g_led_config;
+extern const uint8_t led_scale_indicator[12][12];
+extern const uint8_t led_single_col_indicator[37][3];
+
+    //  default base layer color
+#   define BASE_LAYER_COLOR  RGB_DARKGOLDENROD
+
+    //  border color
+#   define FLIP_BORDER_COLOR RGB_DARKRED
+
+    // flip entirely
+#   define FLIPB_LAYER_COLOR RGB_DARKYELLOW
+
+    //  channel separation group
+#   define SEPALEFT_LAYER_COLOR RGB_DARKGREEN
+#   define SEPAHALF_LAYER_COLOR RGB_DARKGREEN
+#   define SEPARIGHT_LAYER_COLOR RGB_DARKGREEN
+
+    //  Trans group
+#   define TRANS_LAYER_COLOR RGB_DARKORANGE
+#   define SEPALEFT_T_LAYER_COLOR RGB_DARKORANGE
+#   define SEPAHALF_T_LAYER_COLOR RGB_DARKORANGE
+#   define SEPARIGHT_T_LAYER_COLOR RGB_DARKORANGE
+#   define FLIPT_LAYER_COLOR RGB_DARKORANGE
+#endif  //  RGB_MATRIX_ENABLE
+
+// Defines names for use in _FN layer to specify which column to be used to turn on the LEDs.
+// use this with led_single_col_indicator[37][3], ex. led_single_col_indicator[_FN_C2][0].
+enum my_key_names {
+    _KEY01= 0,
+    _KEY02,
+    _KEY03,
+    _KEY04,
+    _KEY05,
+    _KEY06,
+    _KEY07,
+    _KEY08,
+    _KEY09,
+    _KEY10,
+    _KEY11,
+    _KEY12,
+    _KEY13,
+    _KEY14,
+    _KEY15,
+    _KEY16,
+    _KEY17,
+    _KEY18,
+    _KEY19,
+    _KEY20,
+    _KEY21,
+    _KEY22,
+    _KEY23,
+    _KEY24,
+    _KEY25,
+    _KEY26,
+    _KEY27,
+    _KEY28,
+    _KEY29,
+    _KEY30,
+    _KEY31,
+    _KEY32,
+    _KEY33,
+    _KEY34,
+    _KEY35,
+    _KEY36,
+    _KEY37,
+};
+
+#ifdef MIDI_ENABLE
+extern MidiDevice midi_device;
+#endif  //  MIDI_ENABLE
+
+uint8_t shift_led_indicator_left(uint8_t scale_indicator_col);
+uint8_t shift_led_indicator_right(uint8_t scale_indicator_col);
+
+void encoder_action_unregister(void);
+
+void encoder_action_register(uint8_t index, bool clockwise);
diff --git a/keyboards/chromatonemini/config.h b/keyboards/chromatonemini/config.h
new file mode 100644
index 0000000000..49b8eef7a8
--- /dev/null
+++ b/keyboards/chromatonemini/config.h
@@ -0,0 +1,283 @@
+/*
+Copyright 2021 3araht
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#include "config_common.h"
+
+/* key matrix size */
+#define MATRIX_ROWS 6
+#define MATRIX_COLS 8
+
+/*
+ * Keyboard Matrix Assignments
+ *
+ * Change this to how you wired your keyboard
+ * COLS: AVR pins used for columns, left to right
+ * ROWS: AVR pins used for rows, top to bottom
+ * DIODE_DIRECTION: COL2ROW = COL = Anode (+), ROW = Cathode (-, marked on diode)
+ *                  ROW2COL = ROW = Anode (+), COL = Cathode (-, marked on diode)
+ *
+ */
+#define MATRIX_ROW_PINS { E6, D7, C6, D4, D0, D1 }
+#define MATRIX_COL_PINS { F4, F5, F6, F7, B1, B3, B2, B6 }
+#define UNUSED_PINS
+
+/* COL2ROW, ROW2COL */
+#define DIODE_DIRECTION COL2ROW
+
+/*
+ * Split Keyboard specific options, make sure you have 'SPLIT_KEYBOARD = yes' in your rules.mk, and define SOFT_SERIAL_PIN.
+ */
+// #define SOFT_SERIAL_PIN D0  // or D1, D2, D3, E6
+
+//#define LED_NUM_LOCK_PIN B0
+//#define LED_CAPS_LOCK_PIN B1
+//#define LED_SCROLL_LOCK_PIN B2
+//#define LED_COMPOSE_PIN B3
+//#define LED_KANA_PIN B4
+
+//#define BACKLIGHT_PIN B7
+//#define BACKLIGHT_LEVELS 3
+//#define BACKLIGHT_BREATHING
+
+/* ws2812 RGB LED */
+#define RGB_DI_PIN D3
+//#ifdef RGB_DI_PIN
+//#    define RGBLED_NUM 16
+//#    define RGBLIGHT_HUE_STEP 8
+//#    define RGBLIGHT_SAT_STEP 8
+//#    define RGBLIGHT_VAL_STEP 8
+//#    define RGBLIGHT_LIMIT_VAL 255 /* The maximum brightness level */
+//#    define RGBLIGHT_SLEEP  /* If defined, the RGB lighting will be switched off when the host goes to sleep */
+/*== all animations enable ==*/
+//#    define RGBLIGHT_ANIMATIONS
+/*== or choose animations ==*/
+//#    define RGBLIGHT_EFFECT_BREATHING
+//#    define RGBLIGHT_EFFECT_RAINBOW_MOOD
+//#    define RGBLIGHT_EFFECT_RAINBOW_SWIRL
+//#    define RGBLIGHT_EFFECT_SNAKE
+//#    define RGBLIGHT_EFFECT_KNIGHT
+//#    define RGBLIGHT_EFFECT_CHRISTMAS
+//#    define RGBLIGHT_EFFECT_STATIC_GRADIENT
+//#    define RGBLIGHT_EFFECT_RGB_TEST
+//#    define RGBLIGHT_EFFECT_ALTERNATING
+/*== customize breathing effect ==*/
+/*==== (DEFAULT) use fixed table instead of exp() and sin() ====*/
+//#    define RGBLIGHT_BREATHE_TABLE_SIZE 256      // 256(default) or 128 or 64
+/*==== use exp() and sin() ====*/
+//#    define RGBLIGHT_EFFECT_BREATHE_CENTER 1.85  // 1 to 2.7
+//#    define RGBLIGHT_EFFECT_BREATHE_MAX    255   // 0 to 255
+//#endif
+
+
+#ifdef RGB_MATRIX_ENABLE
+
+/* ws2812 RGB MATRIX */
+#   define DRIVER_LED_TOTAL 116
+
+ // reacts to keypresses
+#   define RGB_MATRIX_KEYPRESSES
+
+//  for all fingers used at once.
+#   define LED_HITS_TO_REMEMBER 10
+
+#   define RGB_MATRIX_MAXIMUM_BRIGHTNESS 50
+#   define RGB_MATRIX_STARTUP_SPD 127
+#   define RGB_MATRIX_CENTER { 124, 32 }
+// the above brighness setting has no effect on rgb_matrix_set_color().
+// Use darker colors instead.
+/*              RGB darker COLORS             */
+#   define RGB_DARKWHITE 0x33, 0x33, 0x33
+#   define RGB_DARKRED 0x33, 0x0, 0x0
+#   define RGB_DARKCORAL 0x33, 0x18, 0xF
+#   define RGB_DARKORANGE 0x33, 0x19, 0x0
+#   define RGB_DARKGOLDENROD 0x2B, 0x21, 0x6
+#   define RGB_DARKGOLD 0x33, 0x2B, 0x0
+#   define RGB_DARKYELLOW 0x33, 0x33, 0x0
+#   define RGB_DARKCHARTREUSE 0x19, 0x33, 0x0
+#   define RGB_DARKGREEN 0x0, 0x33, 0x0
+#   define RGB_DARKSPRINGGREEN 0x0, 0x33, 0x19
+#   define RGB_DARKTURQUOISE 0xE, 0x16, 0x15
+#   define RGB_DARKTEAL 0x0, 0x19, 0x19
+#   define RGB_DARKCYAN 0x0, 0x33, 0x33
+#   define RGB_DARKAZURE 0x1E, 0x31, 0x33
+#   define RGB_DARKBLUE 0x0, 0x0, 0x33
+#   define RGB_DARKPURPLE 0x18, 0x0, 0x33
+#   define RGB_DARKMAGENTA 0x33, 0x0, 0x33
+#   define RGB_DARKPINK 0x33, 0x19, 0x26
+
+//  https://docs.qmk.fm/#/feature_rgb_matrix
+//  Enable suspend mode.
+#   define RGB_DISABLE_WHEN_USB_SUSPENDED
+
+#   ifdef CONSOLE_ENABLE
+#       define ENABLE_RGB_MATRIX_SOLID_COLOR
+#       define ENABLE_RGB_MATRIX_SOLID_REACTIVE_MULTIWIDE
+#   else
+#       define ENABLE_RGB_MATRIX_GRADIENT_UP_DOWN
+#       define ENABLE_RGB_MATRIX_GRADIENT_LEFT_RIGHT
+#       define ENABLE_RGB_MATRIX_BREATHING
+#       define ENABLE_RGB_MATRIX_BAND_SAT
+#       define ENABLE_RGB_MATRIX_BAND_VAL
+#       define ENABLE_RGB_MATRIX_BAND_PINWHEEL_SAT
+#       define ENABLE_RGB_MATRIX_BAND_PINWHEEL_VAL
+#       define ENABLE_RGB_MATRIX_BAND_SPIRAL_SAT
+#       define ENABLE_RGB_MATRIX_BAND_SPIRAL_VAL
+#       define ENABLE_RGB_MATRIX_CYCLE_ALL
+#       define ENABLE_RGB_MATRIX_CYCLE_LEFT_RIGHT
+#       define ENABLE_RGB_MATRIX_CYCLE_UP_DOWN
+#       define ENABLE_RGB_MATRIX_RAINBOW_MOVING_CHEVRON
+#       define ENABLE_RGB_MATRIX_CYCLE_OUT_IN
+#       define ENABLE_RGB_MATRIX_CYCLE_OUT_IN_DUAL
+#       define ENABLE_RGB_MATRIX_CYCLE_PINWHEEL
+#       define ENABLE_RGB_MATRIX_CYCLE_SPIRAL
+#       define ENABLE_RGB_MATRIX_DUAL_BEACON
+#       define ENABLE_RGB_MATRIX_RAINBOW_BEACON
+#       define ENABLE_RGB_MATRIX_RAINBOW_PINWHEELS
+#       define ENABLE_RGB_MATRIX_RAINDROPS
+#       define ENABLE_RGB_MATRIX_JELLYBEAN_RAINDROPS
+#       define ENABLE_RGB_MATRIX_HUE_BREATHING
+#       define ENABLE_RGB_MATRIX_HUE_PENDULUM
+#       define ENABLE_RGB_MATRIX_HUE_WAVE
+#       define ENABLE_RGB_MATRIX_TYPING_HEATMAP
+#       define ENABLE_RGB_MATRIX_DIGITAL_RAIN
+#       define ENABLE_RGB_MATRIX_SOLID_REACTIVE_SIMPLE
+#       define ENABLE_RGB_MATRIX_SOLID_REACTIVE
+#       define ENABLE_RGB_MATRIX_SOLID_REACTIVE_WIDE
+#       define ENABLE_RGB_MATRIX_SOLID_REACTIVE_MULTIWIDE
+#       define ENABLE_RGB_MATRIX_SOLID_REACTIVE_CROSS
+#       define ENABLE_RGB_MATRIX_SOLID_REACTIVE_MULTICROSS
+#       define ENABLE_RGB_MATRIX_SOLID_REACTIVE_NEXUS
+#       define ENABLE_RGB_MATRIX_SOLID_REACTIVE_MULTINEXUS
+#       define ENABLE_RGB_MATRIX_SPLASH
+#       define ENABLE_RGB_MATRIX_MULTISPLASH
+#       define ENABLE_RGB_MATRIX_SOLID_SPLASH
+#       define ENABLE_RGB_MATRIX_SOLID_MULTISPLASH
+#   endif  // CONSOLE_ENABLE
+#endif  // RGB_MATRIX_ENABLE
+
+/* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */
+#define DEBOUNCE 5
+
+/* define if matrix has ghost (lacks anti-ghosting diodes) */
+//#define MATRIX_HAS_GHOST
+
+// /* Mechanical locking support. Use KC_LCAP, KC_LNUM or KC_LSCR instead in keymap */
+// #define LOCKING_SUPPORT_ENABLE
+// /* Locking resynchronize hack */
+// #define LOCKING_RESYNC_ENABLE
+
+/* If defined, GRAVE_ESC will always act as ESC when CTRL is held.
+ * This is useful for the Windows task manager shortcut (ctrl+shift+esc).
+ */
+//#define GRAVE_ESC_CTRL_OVERRIDE
+
+/*
+ * Force NKRO
+ *
+ * Force NKRO (nKey Rollover) to be enabled by default, regardless of the saved
+ * state in the bootmagic EEPROM settings. (Note that NKRO must be enabled in the
+ * makefile for this to work.)
+ *
+ * If forced on, NKRO can be disabled via magic key (default = LShift+RShift+N)
+ * until the next keyboard reset.
+ *
+ * NKRO may prevent your keystrokes from being detected in the BIOS, but it is
+ * fully operational during normal computer usage.
+ *
+ * For a less heavy-handed approach, enable NKRO via magic key (LShift+RShift+N)
+ * or via bootmagic (hold SPACE+N while plugging in the keyboard). Once set by
+ * bootmagic, NKRO mode will always be enabled until it is toggled again during a
+ * power-up.
+ *
+ */
+//#define FORCE_NKRO
+
+/*
+ * Feature disable options
+ *  These options are also useful to firmware size reduction.
+ */
+
+/* disable debug print */
+//#define NO_DEBUG
+
+/* disable print */
+//#define NO_PRINT
+
+/* disable action features */
+//#define NO_ACTION_LAYER
+//#define NO_ACTION_TAPPING
+//#define NO_ACTION_ONESHOT
+
+/* Bootmagic Lite key configuration */
+//#define BOOTMAGIC_LITE_ROW 0
+//#define BOOTMAGIC_LITE_COLUMN 0
+
+/* Audio */
+#ifdef AUDIO_ENABLE
+#   define AUDIO_PIN B6  // use PB6 = PIN10 as Audio output
+// #define DAC_SAMPLE_MAX 32768U
+#   define DAC_SAMPLE_MAX 65535U
+// #define AUDIO_CLICKY
+#   define NO_MUSIC_MODE
+// #define STARTUP_SONG SONG(FANTASIE_IMPROMPTU)
+// #define STARTUP_SONG SONG(NOCTURNE_OP_9_NO_1)
+// #define STARTUP_SONG SONG(USSR_ANTHEM)
+// #define STARTUP_SONG SONG(CAMPANELLA)
+#endif  //  AUDIO_ENABLE
+
+/*
+ * MIDI options
+ */
+
+/* enable basic MIDI features:
+   - MIDI notes can be sent when in Music mode is on
+*/
+//#define MIDI_BASIC
+
+/* enable advanced MIDI features:
+   - MIDI notes can be added to the keymap
+   - Octave shift and transpose
+   - Virtual sustain, portamento, and modulation wheel
+   - etc.
+*/
+#ifdef MIDI_ENABLE
+#   define MIDI_ADVANCED
+// Initial velocity value (avoid using 127 since it is used as a special number in some sound sources.)
+#   define MIDI_INITIAL_VELOCITY 117
+#endif  //  MIDI_ENABLE
+
+/*
+ * Encoder options
+ */
+#ifdef ENCODER_ENABLE
+#   define ENCODERS_PAD_A { B5 }
+#   define ENCODERS_PAD_B { B4 }
+#   define ENCODER_RESOLUTION 4
+#   define TAP_CODE_DELAY 10
+
+#define ENCODERS 1
+#define ENCODERS_CW_KEY  { {7, 2} }
+#define ENCODERS_CCW_KEY { {7, 1} }
+#endif  // ENCODER_ENABLE
+
+/* 2021/01/22 added to shrink firmware size */
+// NO_ACTION_TAPPING -1964 bytes, however, this disables Layer mods...
+// #define NO_ACTION_TAPPING
+// NO_ACTION_ONESHOT -388 bytes
+#define NO_ACTION_ONESHOT
diff --git a/keyboards/chromatonemini/info.json b/keyboards/chromatonemini/info.json
new file mode 100644
index 0000000000..5f77db05ee
--- /dev/null
+++ b/keyboards/chromatonemini/info.json
@@ -0,0 +1,61 @@
+{
+    "keyboard_name": "chromatonemini",
+    "manufacturer": "3araht",
+    "url": "https://github.com/3araht/chromatonemini",
+    "maintainer": "3araht",
+    "usb": {
+        "vid": "0xFEED",
+        "pid": "0xF4B4",
+        "device_version": "0.0.1"
+    },
+    "layouts": {
+        "LAYOUT": {
+            "layout": [
+                {"label":"enc", "x":0.5, "y":0},
+                {"label":"sustain", "x":1.5, "y":0},
+                {"label":"ccw", "x":2.5, "y":0},
+                {"label":"cw", "x":3.5, "y":0},
+                {"label":"up", "x":0.5, "y":1.5},
+                {"label":"left", "x":0, "y":2.5},
+                {"label":"right", "x":1, "y":2.5},
+                {"label":"k01", "x":2.5, "y":2.5},
+                {"label":"k03", "x":3.5, "y":2.5},
+                {"label":"k05", "x":4.5, "y":2.5},
+                {"label":"k07", "x":5.5, "y":2.5},
+                {"label":"k09", "x":6.5, "y":2.5},
+                {"label":"k11", "x":7.5, "y":2.5},
+                {"label":"k13", "x":8.5, "y":2.5},
+                {"label":"k15", "x":9.5, "y":2.5},
+                {"label":"k17", "x":10.5, "y":2.5},
+                {"label":"k19", "x":11.5, "y":2.5},
+                {"label":"k21", "x":12.5, "y":2.5},
+                {"label":"k23", "x":13.5, "y":2.5},
+                {"label":"k25", "x":14.5, "y":2.5},
+                {"label":"k27", "x":15.5, "y":2.5},
+                {"label":"k29", "x":16.5, "y":2.5},
+                {"label":"k31", "x":17.5, "y":2.5},
+                {"label":"k33", "x":18.5, "y":2.5},
+                {"label":"k35", "x":19.5, "y":2.5},
+                {"label":"k37", "x":20.5, "y":2.5},
+                {"label":"down", "x":0.5, "y":3.5},
+                {"label":"k02", "x":3, "y":3.5},
+                {"label":"k04", "x":4, "y":3.5},
+                {"label":"k06", "x":5, "y":3.5},
+                {"label":"k08", "x":6, "y":3.5},
+                {"label":"k10", "x":7, "y":3.5},
+                {"label":"k12", "x":8, "y":3.5},
+                {"label":"k14", "x":9, "y":3.5},
+                {"label":"k16", "x":10, "y":3.5},
+                {"label":"k18", "x":11, "y":3.5},
+                {"label":"k20", "x":12, "y":3.5},
+                {"label":"k22", "x":13, "y":3.5},
+                {"label":"k24", "x":14, "y":3.5},
+                {"label":"k26", "x":15, "y":3.5},
+                {"label":"k28", "x":16, "y":3.5},
+                {"label":"k30", "x":17, "y":3.5},
+                {"label":"k32", "x":18, "y":3.5},
+                {"label":"k34", "x":19, "y":3.5},
+                {"label":"k36", "x":20, "y":3.5}]
+        }
+    }
+}
diff --git a/keyboards/chromatonemini/keymaps/default/keymap.c b/keyboards/chromatonemini/keymaps/default/keymap.c
new file mode 100644
index 0000000000..102aba930a
--- /dev/null
+++ b/keyboards/chromatonemini/keymaps/default/keymap.c
@@ -0,0 +1,106 @@
+/* Copyright 2021 3araht
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include QMK_KEYBOARD_H
+#include "version.h"
+
+// Defines names for use in layer keycodes and the keymap
+enum layer_names {
+    _BASE,
+    _RESERVE,
+    _FN
+};
+
+// Defines the keycodes used by our macros in process_record_user
+enum custom_keycodes {
+    L_BASE = SAFE_RANGE,
+    L_RESERVE,
+    VERSION
+};
+
+// Long press: go to _FN layer, tap: MUTE
+#define FN_MUTE LT(_FN, KC_MUTE)
+
+// Used to set octave to MI_OCT_0
+extern midi_config_t midi_config;
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    /* Base */
+    [_BASE] = LAYOUT(
+            FN_MUTE,          MI_SUS,                            KC_VOLD, KC_VOLU,
+            MI_BENDU,
+        MI_TRNSD, MI_TRNSU,  MI_C_2, MI_D_2, MI_E_2,  MI_Fs_2, MI_Ab_2, MI_Bb_2, MI_C_3, MI_D_3, MI_E_3, MI_Fs_3, MI_Ab_3, MI_Bb_3, MI_C_4,  MI_D_4,  MI_E_4, MI_Fs_4, MI_Ab_4, MI_Bb_4, MI_C_5,
+            MI_BENDD,           MI_Db_2, MI_Eb_2, MI_F_2,  MI_G_2,  MI_A_2,  MI_B_2, MI_Db_3, MI_Eb_3, MI_F_3,  MI_G_3, MI_A_3,  MI_B_3, MI_Db_4, MI_Eb_4, MI_F_4,  MI_G_4,  MI_A_4,  MI_B_4
+    ),
+
+    /* RESERVE */
+    [_RESERVE] = LAYOUT(
+            _______,          _______,                             _______, _______,
+            _______,
+        _______, _______,      _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+            _______,               _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______
+    ),
+
+    [_FN] =  LAYOUT(
+            _______,          XXXXXXX,                             XXXXXXX, XXXXXXX,
+            MI_VELU,
+        MI_OCTD, MI_OCTU,     L_BASE, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, VERSION, XXXXXXX, XXXXXXX,
+            MI_VELD,               L_RESERVE, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, EEP_RST, XXXXXXX, XXXXXXX
+    )
+};
+
+// commom codes called from eeconfig_init_user() and keyboard_post_init_user().
+void my_init(void){
+    //  Set octave to MI_OCT_1
+    midi_config.octave = MI_OCT_0 - MIDI_OCTAVE_MIN;
+    // avoid using 127 since it is used as a special number in some sound sources.
+    midi_config.velocity = MIDI_INITIAL_VELOCITY;
+    default_layer_set(1UL << _BASE);
+}
+
+void eeconfig_init_user(void) {  // EEPROM is getting reset!
+    midi_init();
+    my_init(); // commom codes called from eeconfig_init_user() and keyboard_post_init_user().
+}
+
+void keyboard_post_init_user(void) {
+    my_init(); // commom codes called from eeconfig_init_user() and keyboard_post_init_user().
+};
+
+void reset_scale_indicator(void) {
+    //  reset transpose value and scale_indicator_col to default.
+    midi_config.transpose = 0;
+}
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    switch (keycode) {
+        case VERSION: // Output firmware info.
+            if (record->event.pressed) {
+                SEND_STRING(QMK_KEYBOARD ":" QMK_KEYMAP " @ " QMK_VERSION " | " QMK_BUILDDATE);
+            }
+            break;
+
+        case L_BASE:
+            reset_scale_indicator();
+            default_layer_set(1UL << _BASE);
+            break;
+
+        case L_RESERVE:
+            reset_scale_indicator();
+            default_layer_set(1UL << _RESERVE);
+            break;
+    }
+    return true;
+}
diff --git a/keyboards/chromatonemini/keymaps/default/readme.md b/keyboards/chromatonemini/keymaps/default/readme.md
new file mode 100644
index 0000000000..4a18250f97
--- /dev/null
+++ b/keyboards/chromatonemini/keymaps/default/readme.md
@@ -0,0 +1 @@
+# The default keymap for chromatonemini
diff --git a/keyboards/chromatonemini/keymaps/led/keymap.c b/keyboards/chromatonemini/keymaps/led/keymap.c
new file mode 100644
index 0000000000..99da8ed0c9
--- /dev/null
+++ b/keyboards/chromatonemini/keymaps/led/keymap.c
@@ -0,0 +1,682 @@
+/* Copyright 2021 3araht
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include QMK_KEYBOARD_H
+#include "version.h"
+
+//  define which MIDI ch to use.
+//  Note that (actual MIDI ch# - 1) -> 0 .. 15 is used for coding.
+//  ch1
+#define DEFAULT_MAIN_CH_NUMBER 0
+//  ch3
+#define DEFAULT_SUB_CH_NUMBER  2
+//  ch2
+#define ALT_MAIN_CH_NUMBER     1
+//  ch4
+#define ALT_SUB_CH_NUMBER      3
+static uint8_t midi_left_ch = DEFAULT_SUB_CH_NUMBER;       //  By default, DEFAULT_SUB_CH_NUMBER is used for left side when separated.
+
+//  By default( when use_alt_ch_gr == false), DEFAULT ch group (DEFAULT_MAIN_CH_NUMBER for entirely, or right side when separated, DEFAULT_SUB_CH_NUMBER for left side) is used.
+//  When false, ALT ch group (ALT_MAIN_CH_NUMBER for entirely, or right side when separated, ALT_SUB_CH_NUMBER for left side) is used.
+static bool use_alt_ch_gr = false;
+
+// Defines names for use in layer keycodes and the keymap
+enum layer_names {
+    _BASE,              //  Base layer, shift mode, single channel.
+    _SEPALEFTOCT,       //  1st oct channel separated version. Shift mode.
+    _SEPAHALF,          //  Half channel separated version. Shift mode.
+    _SEPARIGHTOCT,      //  2nd oct channel separated version. Shift mode.
+    _TRANS,             //  Transpose feature is enabled instead of shift mode, single channel.
+    _FLIPBASE,          //  Horizontal flipped version entirely. single channel.
+    _FLIPTRANS,         //  Horizontal flipped version entirely. Transpose is used. single channel.
+    _FN                 //  FuNction layer. This must be at the end of the enumurate to use the range from _LS_FN ... _LS_FN_MAX for FN layer LED settings.
+};
+
+//  Layer State
+#define _LS_BASE           (1UL << _BASE)
+#define _LS_SEPALEFTOCT    (1UL << _SEPALEFTOCT)
+#define _LS_SEPAHALF       (1UL << _SEPAHALF)
+#define _LS_SEPARIGHTOCT   (1UL << _SEPARIGHTOCT)
+#define _LS_FLIPBASE       (1UL << _FLIPBASE)
+
+#define _LS_TRANS          (1UL << _BASE         | 1UL << _TRANS)
+#define _LS_SEPALEFTOCT_T  (1UL << _SEPALEFTOCT  | 1UL << _TRANS)
+#define _LS_SEPAHALF_T     (1UL << _SEPAHALF     | 1UL << _TRANS)
+#define _LS_SEPARIGHTOCT_T (1UL << _SEPARIGHTOCT | 1UL << _TRANS)
+#define _LS_FLIPTRANS      (1UL << _FLIPBASE     | 1UL << _FLIPTRANS)
+
+#define _LS_FN             (1UL << _FN)
+#define _LS_MAX            (_LS_FN << 1)
+
+//  Don't change the DEFAULT_SCALE_COL value below. It must be 0.
+#define DEFAULT_SCALE_COL 0
+static uint8_t scale_indicator_col = DEFAULT_SCALE_COL;
+static bool trans_mode_indicator_loc_sel = true;  // when it is true, the location is _KEY01, _KEY13, ...
+
+//  use led indicator or not.
+static bool led_indicator_enable = true;
+
+// Defines the keycodes used by our macros in process_record_user
+enum custom_keycodes {
+    SHIFT_L = SAFE_RANGE,
+    SHIFT_R,
+    TGLINDI,  //  ToGgLe INDIcator
+    TGLINTR,  //  ToGgLe INdicator location {(_KEY01, _KEY13, _KEY25, _KEY37) or (_KEY02, _KEY14, _KEY26) / (_KEY12, _KEY24, _KEY36)}in TRans mode
+    TGLTRNS,  //  ToGgLe TRaNS and shift
+    TGLCHGR,  //  ToGgLe CH GRoup
+    VERSION,
+
+    B_BASE,            //  border set to the left end.
+    B_LEFT,            //  border set to the 1st left octave.
+    B_CENTER,          //  border set to the center.
+    B_RIGHT,           //  border set to the 1st right octave.
+    B_FLIP,            //  border set to the right end.
+
+    // MY tone for _FLIPHALF and _FLIPLEFTOCT layers to distinguish the notes to avoid sustain effect, etc.
+    // Since they are flipped, their subscripts are not MY_ but YM_, to make them easier to tell.
+    YM_TONE_MIN,
+
+    YM_C = YM_TONE_MIN,
+    YM_Cs,
+    YM_Db = YM_Cs,
+    YM_D,
+    YM_Ds,
+    YM_Eb = YM_Ds,
+    YM_E,
+    YM_F,
+    YM_Fs,
+    YM_Gb = YM_Fs,
+    YM_G,
+    YM_Gs,
+    YM_Ab = YM_Gs,
+    YM_A,
+    YM_As,
+    YM_Bb = YM_As,
+    YM_B,
+
+    YM_C_1,
+    YM_Cs_1,
+    YM_Db_1 = YM_Cs_1,
+    YM_D_1,
+    YM_Ds_1,
+    YM_Eb_1 = YM_Ds_1,
+    YM_E_1,
+    YM_F_1,
+    YM_Fs_1,
+    YM_Gb_1 = YM_Fs_1,
+    YM_G_1,
+    YM_Gs_1,
+    YM_Ab_1 = YM_Gs_1,
+    YM_A_1,
+    YM_As_1,
+    YM_Bb_1 = YM_As_1,
+    YM_B_1,
+
+    YM_C_2,
+    YM_Cs_2,
+    YM_Db_2 = YM_Cs_2,
+    YM_D_2,
+    YM_Ds_2,
+    YM_Eb_2 = YM_Ds_2,
+    YM_E_2,
+    YM_F_2,
+    YM_Fs_2,
+    YM_Gb_2 = YM_Fs_2,
+    YM_G_2,
+    YM_Gs_2,
+    YM_Ab_2 = YM_Gs_2,
+    YM_A_2,
+    YM_As_2,
+    YM_Bb_2 = YM_As_2,
+    YM_B_2,
+
+    YM_C_3,
+    YM_Cs_3,
+    YM_Db_3 = YM_Cs_3,
+    YM_D_3,
+    YM_Ds_3,
+    YM_Eb_3 = YM_Ds_3,
+    YM_E_3,
+    YM_F_3,
+    YM_Fs_3,
+    YM_Gb_3 = YM_Fs_3,
+    YM_G_3,
+    YM_Gs_3,
+    YM_Ab_3 = YM_Gs_3,
+    YM_A_3,
+    YM_As_3,
+    YM_Bb_3 = YM_As_3,
+    YM_B_3,
+
+    YM_C_4,
+    YM_Cs_4,
+    YM_Db_4 = YM_Cs_4,
+    YM_D_4,
+    YM_Ds_4,
+    YM_Eb_4 = YM_Ds_4,
+    YM_E_4,
+    YM_F_4,
+    YM_Fs_4,
+    YM_Gb_4 = YM_Fs_4,
+    YM_G_4,
+    YM_Gs_4,
+    YM_Ab_4 = YM_Gs_4,
+    YM_A_4,
+    YM_As_4,
+    YM_Bb_4 = YM_As_4,
+    YM_B_4,
+
+    YM_C_5,
+    YM_Cs_5,
+    YM_Db_5 = YM_Cs_5,
+    YM_D_5,
+    YM_Ds_5,
+    YM_Eb_5 = YM_Ds_5,
+    YM_E_5,
+    YM_F_5,
+    YM_Fs_5,
+    YM_Gb_5 = YM_Fs_5,
+    YM_G_5,
+    YM_Gs_5,
+    YM_Ab_5 = YM_Gs_5,
+    YM_A_5,
+    YM_As_5,
+    YM_Bb_5 = YM_As_5,
+    YM_B_5,
+
+    YM_C_6,
+    YM_TONE_MAX = YM_C_6
+};
+
+#define MY_TONE_COUNT (YM_TONE_MAX - YM_TONE_MIN + 1)
+static uint8_t my_tone_status[MY_TONE_COUNT];
+
+// Long press: go to _FN layer, tap: MUTE
+#define FN_MUTE LT(_FN, KC_MUTE)
+
+// Used to set octave to MI_OCT_0
+extern midi_config_t midi_config;
+static bool is_trans_mode = false;     //  By default, shift mode is chosen.
+
+static uint8_t key_separator_col = _KEY01;  //  (_KEY01 .. _KEY37).     By default, _KEY01 (= _BASE layer) is chosen. _KEY13 = *LEFT, _KEY19 = *HALF, _KEY25 = *RIGHT, _KEY37 = _FLIPBASE and _FLIPTRANS.
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    /* Base */
+    [_BASE] = LAYOUT(
+            FN_MUTE,         MI_SUS,                             KC_VOLD, KC_VOLU,
+            MI_BENDU,
+        SHIFT_L, SHIFT_R,    MI_C_2, MI_D_2, MI_E_2,  MI_Fs_2, MI_Ab_2, MI_Bb_2, MI_C_3, MI_D_3, MI_E_3, MI_Fs_3, MI_Ab_3, MI_Bb_3, MI_C_4,  MI_D_4,  MI_E_4, MI_Fs_4, MI_Ab_4, MI_Bb_4, MI_C_5,
+            MI_BENDD,           MI_Db_2, MI_Eb_2, MI_F_2,  MI_G_2,  MI_A_2,  MI_B_2, MI_Db_3, MI_Eb_3, MI_F_3,  MI_G_3, MI_A_3,  MI_B_3, MI_Db_4, MI_Eb_4, MI_F_4,  MI_G_4,  MI_A_4,  MI_B_4
+    ),
+
+    /* 1 octave on the left side is ch2, others are ch1 (normal) */
+    [_SEPALEFTOCT] = LAYOUT(
+            _______,          _______,                             _______, _______,
+            _______,
+        SHIFT_L, SHIFT_R,     YM_C_2, YM_D_2, YM_E_2,  YM_Fs_2, YM_Ab_2, YM_Bb_2,     MI_C_3, MI_D_3, MI_E_3, MI_Fs_3, MI_Ab_3, MI_Bb_3, MI_C_4,  MI_D_4,  MI_E_4, MI_Fs_4, MI_Ab_4, MI_Bb_4, MI_C_5,
+            _______,             YM_Db_2, YM_Eb_2, YM_F_2,  YM_G_2,  YM_A_2,  YM_B_2,     MI_Db_3, MI_Eb_3, MI_F_3,  MI_G_3, MI_A_3,  MI_B_3, MI_Db_4, MI_Eb_4, MI_F_4,  MI_G_4,  MI_A_4,  MI_B_4
+    ),
+
+    /* Half ch2, half ch1 (normal) */
+    [_SEPAHALF] = LAYOUT(
+            _______,           _______,                             _______, _______,
+            _______,
+        SHIFT_L, SHIFT_R,      YM_C_2, YM_D_2, YM_E_2,  YM_Fs_2, YM_Ab_2, YM_Bb_2, YM_C_3, YM_D_3, YM_E_3,       MI_Fs_3, MI_Ab_3, MI_Bb_3, MI_C_4,  MI_D_4,  MI_E_4, MI_Fs_4, MI_Ab_4, MI_Bb_4, MI_C_5,
+            _______,               YM_Db_2, YM_Eb_2, YM_F_2,  YM_G_2,  YM_A_2,  YM_B_2, YM_Db_3, YM_Eb_3, YM_F_3,    MI_G_3, MI_A_3,  MI_B_3, MI_Db_4, MI_Eb_4, MI_F_4,  MI_G_4,  MI_A_4,  MI_B_4
+    ),
+
+    /* 2 octave on the left side is ch2, others are ch1 (normal) */
+    [_SEPARIGHTOCT] = LAYOUT(
+            _______,           _______,                             _______, _______,
+            _______,
+        SHIFT_L, SHIFT_R,      YM_C_2, YM_D_2, YM_E_2,  YM_Fs_2, YM_Ab_2, YM_Bb_2, YM_C_3, YM_D_3, YM_E_3, YM_Fs_3, YM_Ab_3, YM_Bb_3,      MI_C_4,  MI_D_4,  MI_E_4, MI_Fs_4, MI_Ab_4, MI_Bb_4, MI_C_5,
+            _______,               YM_Db_2, YM_Eb_2, YM_F_2,  YM_G_2,  YM_A_2,  YM_B_2, YM_Db_3, YM_Eb_3, YM_F_3,  YM_G_3, YM_A_3,  YM_B_3,     MI_Db_4, MI_Eb_4, MI_F_4,  MI_G_4,  MI_A_4,  MI_B_4
+    ),
+
+    /* TRANS   This layer must locate 1 layer below _FN layer. */
+    [_TRANS] = LAYOUT(
+            _______,           _______,                             _______, _______,
+            _______,
+        MI_TRNSD, MI_TRNSU,   _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+            _______,               _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______
+    ),
+
+    /* Flip Base    SFIFTUP and SHIFT_L are swapped. */
+    [_FLIPBASE] = LAYOUT(
+            FN_MUTE,          MI_SUS,                             KC_VOLD, KC_VOLU,
+            MI_BENDU,
+        SHIFT_L, SHIFT_R,     MI_C_5, MI_Bb_4, MI_Ab_4,  MI_Fs_4, MI_E_4, MI_D_4, MI_C_4, MI_Bb_3, MI_Ab_3, MI_Fs_3, MI_E_3, MI_D_3, MI_C_3,  MI_Bb_2,  MI_Ab_2, MI_Fs_2, MI_E_2, MI_D_2, MI_C_2,
+            MI_BENDD,           MI_B_4, MI_A_4, MI_G_4,  MI_F_4,  MI_Eb_4,  MI_Db_4, MI_B_3, MI_A_3, MI_G_3,  MI_F_3, MI_Eb_3,  MI_Db_3, MI_B_2, MI_A_2, MI_G_2,  MI_F_2,  MI_Eb_2,  MI_Db_2
+    ),
+
+    /* Flip Trans   This layer must locate 1 layer above _FLIPBASE layer.  MI_TRNSU and MI_TRNSD are swapped. */
+    [_FLIPTRANS] = LAYOUT(
+            _______,          _______,                             _______, _______,
+            _______,
+        MI_TRNSU, MI_TRNSD,   _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+            _______,               _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______
+    ),
+
+    [_FN] =  LAYOUT(
+            _______,          XXXXXXX,                             RGB_RMOD, RGB_MOD,
+            MI_VELU,
+        MI_OCTD, MI_OCTU,     B_BASE,  XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, B_LEFT, XXXXXXX, XXXXXXX, B_CENTER, XXXXXXX, XXXXXXX, B_RIGHT, XXXXXXX, XXXXXXX, XXXXXXX, VERSION, XXXXXXX, B_FLIP,
+            MI_VELD,               TGLINTR, TGLTRNS, TGLCHGR, XXXXXXX, XXXXXXX, RGB_SAD, RGB_SAI, RGB_HUD, RGB_HUI, RGB_SPD, RGB_SPI, RGB_VAD, RGB_VAI, RGB_RMOD, RGB_MOD, EEP_RST, TGLINDI, RGB_TOG
+    )
+};
+
+// commom codes called from eeconfig_init_user() and keyboard_post_init_user().
+void my_init(void){
+    //  Set octave to MI_OCT_1
+    midi_config.octave = MI_OCT_0 - MIDI_OCTAVE_MIN;
+    // avoid using 127 since it is used as a special number in some sound sources.
+    midi_config.velocity = MIDI_INITIAL_VELOCITY;
+    default_layer_set(_LS_BASE);
+    layer_state_set(_LS_BASE);
+
+#ifdef RGB_MATRIX_ENABLE
+    rgb_matrix_sethsv(HSV_BLUE);
+    rgb_matrix_mode(RGB_MATRIX_CUSTOM_my_solid_reactive_col);
+#endif  // RGB_MATRIX_ENABLE
+}
+
+void eeconfig_init_user(void) {  // EEPROM is getting reset!
+    midi_init();
+
+#ifdef RGB_MATRIX_ENABLE
+    rgb_matrix_enable();
+    rgb_matrix_set_speed(RGB_MATRIX_STARTUP_SPD);
+#endif  // RGB_MATRIX_ENABLE
+    my_init(); // commom codes called from eeconfig_init_user() and keyboard_post_init_user().
+}
+
+void keyboard_post_init_user(void) {
+    for (uint8_t i = 0; i < MY_TONE_COUNT; i++) {
+        my_tone_status[i] = MIDI_INVALID_NOTE;
+    }
+    my_init(); // commom codes called from eeconfig_init_user() and keyboard_post_init_user().
+}
+
+void reset_scale_indicator(void) {
+    //  reset transpose value and scale_indicator_col to default.
+    midi_config.transpose = 0;
+    scale_indicator_col = DEFAULT_SCALE_COL;
+    trans_mode_indicator_loc_sel = true;
+}
+
+void reset_all(void) {
+    reset_scale_indicator();
+    is_trans_mode = false;      //  trans mode is disabled by default.
+}
+
+void my_process_midi4single_note(uint8_t channel, uint16_t keycode, keyrecord_t *record, uint8_t *my_tone_status) {
+    uint8_t  mytone    = keycode - YM_TONE_MIN;
+    uint16_t mykeycode = mytone + MIDI_TONE_MIN;
+    // uint16_t mykeycode = keycode - YM_TONE_MIN;
+    // uint8_t  mytone    = mykeycode - MIDI_TONE_MIN;
+    uint8_t  velocity  = midi_config.velocity;
+    // uprintf("keycode=%u,mykeycode=%u,mytone =%u,velo = %u\n", keycode, mykeycode, mytone, velocity);
+    if (record->event.pressed) {
+        if (my_tone_status[mytone] == MIDI_INVALID_NOTE) {
+            uint8_t note = midi_compute_note(mykeycode);
+            midi_send_noteon(&midi_device, channel, note, velocity);
+            dprintf("midi noteon channel:%d note:%d mytone:%d velocity:%d\n", channel, note, mytone, velocity);
+            // uprintf("midi noteon channel:%d note:%d mytone:%d velocity:%d\n", channel, note, mytone, velocity);
+            my_tone_status[mytone] = note;  // store root_note status.
+        }
+    } else {
+        uint8_t note = my_tone_status[mytone];
+        if (note != MIDI_INVALID_NOTE) {
+            midi_send_noteoff(&midi_device, channel, note, velocity);
+            dprintf("midi noteoff channel:%d note:%d velocity:%d\n", channel, note, velocity);
+            // uprintf("midi noteoff channel:%d note:%d velocity:%d\n", channel, note, velocity);
+        }
+        my_tone_status[mytone] = MIDI_INVALID_NOTE;
+    }
+}
+
+void select_layer_state_set(void) {
+    switch (key_separator_col) {
+        case _KEY01:
+            if (is_trans_mode) {
+                layer_state_set(_LS_TRANS);
+            } else {
+                layer_state_set(_LS_BASE);
+            }
+            break;
+
+        case _KEY13:
+            if (is_trans_mode) {
+                layer_state_set(_LS_SEPALEFTOCT_T);
+            } else {
+                layer_state_set(_LS_SEPALEFTOCT);
+            }
+            break;
+
+        case _KEY19:
+            if (is_trans_mode) {
+                layer_state_set(_LS_SEPAHALF_T);
+            } else {
+                layer_state_set(_LS_SEPAHALF);
+            }
+            break;
+
+        case _KEY25:
+            if (is_trans_mode) {
+                layer_state_set(_LS_SEPARIGHTOCT_T);
+            } else {
+                layer_state_set(_LS_SEPARIGHTOCT);
+            }
+            break;
+
+        case _KEY37:
+            if (is_trans_mode) {
+                layer_state_set(_LS_FLIPTRANS);
+            } else {
+                layer_state_set(_LS_FLIPBASE);
+            }
+            break;
+    }
+}
+
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    // uprintf("keycode=%u, YM_C_3=%u, YM_Db_2 =%u, YM_MIN = %u, YM_MAX = %u\n", keycode, YM_C_3, YM_Db_2, YM_TONE_MIN, YM_TONE_MAX);
+    switch (keycode) {
+        case VERSION: // Output firmware info.
+            if (record->event.pressed) {
+                SEND_STRING(QMK_KEYBOARD ":" QMK_KEYMAP " @ " QMK_VERSION " | " QMK_BUILDDATE);
+            }
+            break;
+
+        //  Layer-related settings.
+        //  reset_scale_indicator() first, followed by each modification, and then change the default layer.
+
+        //  1, separator column modification
+        case B_BASE:
+            if (record->event.pressed) {
+                reset_all();
+                key_separator_col = _KEY01;
+                select_layer_state_set();
+            }
+            break;
+
+        case B_LEFT:
+            if (record->event.pressed) {
+                reset_all();
+                key_separator_col = _KEY13;
+                select_layer_state_set();
+            }
+            break;
+
+        case B_CENTER:
+            if (record->event.pressed) {
+                reset_all();
+                key_separator_col = _KEY19;
+                select_layer_state_set();
+            }
+            break;
+
+        case B_RIGHT:
+            if (record->event.pressed) {
+                reset_all();
+                key_separator_col = _KEY25;
+                select_layer_state_set();
+            }
+            break;
+
+        case B_FLIP:
+            if (record->event.pressed) {
+                reset_all();
+                key_separator_col = _KEY37;
+                select_layer_state_set();
+            }
+            break;
+
+        //  2, Toggle scale shift mode and transpose mode
+        case TGLTRNS:
+            if (record->event.pressed) {
+                reset_scale_indicator();
+                is_trans_mode = !is_trans_mode;
+                select_layer_state_set();
+            }
+            break;
+
+        //  SHIFT_L and SHIFT_R can be pressed only when layer is either _BASE, _FLIPBASE.
+        case SHIFT_L:
+            if (record->event.pressed) {
+                switch (layer_state) {
+                    case _LS_BASE:
+                    case _LS_SEPALEFTOCT:
+                    case _LS_SEPAHALF:
+                    case _LS_SEPARIGHTOCT:
+                    case _LS_FLIPBASE:
+                        scale_indicator_col = shift_led_indicator_left(scale_indicator_col);
+                        break;
+                }
+            }
+            break;
+
+        case SHIFT_R:
+            if (record->event.pressed) {
+                switch (layer_state) {
+                    case _LS_BASE:
+                    case _LS_SEPALEFTOCT:
+                    case _LS_SEPAHALF:
+                    case _LS_SEPARIGHTOCT:
+                    case _LS_FLIPBASE:
+                        scale_indicator_col = shift_led_indicator_right(scale_indicator_col);
+                        break;
+                }
+            }
+            break;
+
+        case TGLINDI:
+            if (record->event.pressed) {
+                led_indicator_enable = !led_indicator_enable;
+            }
+            break;
+
+        case TGLINTR:
+            if (record->event.pressed) {
+                switch (layer_state) {
+                    //  main function of the TGLINTR part 1. alternate the status of trans_mode_indicator_loc_sel.
+                    case _LS_TRANS          | (1UL << _FN):
+                    case _LS_SEPALEFTOCT_T  | (1UL << _FN):
+                    case _LS_SEPAHALF_T     | (1UL << _FN):
+                    case _LS_SEPARIGHTOCT_T | (1UL << _FN):
+                        trans_mode_indicator_loc_sel = !trans_mode_indicator_loc_sel;
+
+                        //  when trans_mode_indicator_loc_sel == false, change the scale indicator and transpose.
+                        scale_indicator_col = trans_mode_indicator_loc_sel ? 0:1;
+                        // when TGLINTR is pressed, it also change the initial transpose setting to follow the scale indicator.
+                        if (scale_indicator_col == 1) {
+                            midi_config.transpose = -1;
+                        } else {
+                            midi_config.transpose = 0;
+                        }
+                        break;
+
+                    //  main function of the TGLINTR part 2. alternate the status of trans_mode_indicator_loc_sel.
+                    case _LS_FLIPTRANS      | (1UL << _FN):
+                        trans_mode_indicator_loc_sel = !trans_mode_indicator_loc_sel;
+
+                        //  when trans_mode_indicator_loc_sel == false, change the scale indicator and transpose.
+                        scale_indicator_col = trans_mode_indicator_loc_sel ? 0:11;
+                        // when TGLINTR is pressed, it also change the initial transpose setting to follow the scale indicator.
+                        if (scale_indicator_col == 11) {
+                            midi_config.transpose = -1;
+                        } else {
+                            midi_config.transpose = 0;
+                        }
+                        break;
+
+                    //  special treatment when TGLINTR is pressed in _LS_FLIPBASE layer.
+                    case _LS_FLIPBASE       | (1UL << _FN):   // when in FLIPBASE layer && non-Trans mode, change it to Trans mode.
+                        trans_mode_indicator_loc_sel = false;
+                        scale_indicator_col = 11;
+                        midi_config.transpose = -1;
+                        is_trans_mode = true;
+                        select_layer_state_set();
+                        break;
+
+
+                    //  special treatment when TGLINTR is pressed in other non-Trans layer.
+                    default :  // when other layers = non-Trans mode, change it to Trans mode.
+                        trans_mode_indicator_loc_sel = false;
+                        scale_indicator_col = 1;
+                        midi_config.transpose = -1;
+                        is_trans_mode = true;
+                        select_layer_state_set();
+                }
+            }
+            break;
+
+        case TGLCHGR:
+            if (record->event.pressed) {
+                use_alt_ch_gr = !use_alt_ch_gr;
+                if (use_alt_ch_gr) {
+                    midi_config.channel = ALT_MAIN_CH_NUMBER;
+                    midi_left_ch = ALT_SUB_CH_NUMBER;
+                } else {  //  default
+                    midi_config.channel = DEFAULT_MAIN_CH_NUMBER;
+                    midi_left_ch = DEFAULT_SUB_CH_NUMBER;
+                }
+            }
+            break;
+
+        case  YM_TONE_MIN ... YM_TONE_MAX:  // MY tone
+            // uprintf("keycode=%u, YM_C_3=%u, YM_Db_2 =%u, YM_MIN = %u, YM_MAX = %u\n", keycode, YM_C_3, YM_Db_2, YM_TONE_MIN, YM_TONE_MAX);
+            //  DO NOT THROW BELOW into 'if (record->event.pressed) {}' STATEMENT SINCE IT IS USED IN THE FUNCTION BELOW.
+            my_process_midi4single_note(midi_left_ch, keycode, record, my_tone_status);
+            break;
+    }
+    return true;
+}
+
+#ifdef RGB_MATRIX_ENABLE
+void set_led_scale_indicator(uint8_t r, uint8_t g, uint8_t b) {
+    uint8_t max_scale_indicator_led_loop;
+    uint8_t i;
+    if (led_indicator_enable) {  //  turn on indicators when enabled.
+        max_scale_indicator_led_loop = ( scale_indicator_col == DEFAULT_SCALE_COL ) ? 12 : 9;
+        for (i = 0; i < max_scale_indicator_led_loop; i++) {
+            rgb_matrix_set_color(led_scale_indicator[scale_indicator_col][i], r, g, b);
+        }
+    }
+}
+
+void rgb_matrix_indicators_user(void) {
+    // uint32_t mode = rgblight_get_mode();
+
+    if (rgb_matrix_is_enabled()) {  // turn the lights on when it is enabled.
+
+        // uint8_t max_scale_indicator_led_loop;
+        uint8_t i;
+
+        switch (layer_state) {
+            case _LS_BASE:
+                set_led_scale_indicator(BASE_LAYER_COLOR);
+                break;
+
+            case _LS_FLIPBASE:
+                set_led_scale_indicator(FLIPB_LAYER_COLOR);
+                for (i = 0; i < 3; i++) {
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY37][i], FLIP_BORDER_COLOR);    //  right end
+                }
+                break;
+
+            case _LS_TRANS:
+                set_led_scale_indicator(TRANS_LAYER_COLOR);
+                break;
+
+            case _LS_SEPALEFTOCT_T:
+                set_led_scale_indicator(SEPALEFT_T_LAYER_COLOR);
+                for (i = 0; i < 3; i++) {
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY13][i], FLIP_BORDER_COLOR);    //  Left
+                }
+                break;
+
+            case _LS_SEPAHALF_T:
+                set_led_scale_indicator(SEPAHALF_T_LAYER_COLOR);
+                for (i = 0; i < 3; i++) {
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY19][i], FLIP_BORDER_COLOR);    //  Center
+                }
+                break;
+
+            case _LS_SEPARIGHTOCT_T:
+                set_led_scale_indicator(SEPARIGHT_T_LAYER_COLOR);
+                for (i = 0; i < 3; i++) {
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY25][i], FLIP_BORDER_COLOR);    //  Right
+                }
+                break;
+
+            case _LS_FLIPTRANS:
+                set_led_scale_indicator(FLIPT_LAYER_COLOR);
+                for (i = 0; i < 3; i++) {
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY37][i], FLIP_BORDER_COLOR);    //  right end
+                }
+                break;
+
+            case _LS_SEPALEFTOCT:
+                set_led_scale_indicator(SEPALEFT_LAYER_COLOR);
+                for (i = 0; i < 3; i++) {
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY13][i], FLIP_BORDER_COLOR);    //  Left
+                }
+                break;
+
+            case _LS_SEPAHALF:
+                set_led_scale_indicator(SEPAHALF_LAYER_COLOR);
+                for (i = 0; i < 3; i++) {
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY19][i], FLIP_BORDER_COLOR);    //  Center
+                }
+                break;
+
+            case _LS_SEPARIGHTOCT:
+                set_led_scale_indicator(SEPARIGHT_LAYER_COLOR);
+                for (i = 0; i < 3; i++) {
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY25][i], FLIP_BORDER_COLOR);    //  Right
+                }
+                break;
+
+            case _LS_FN ... _LS_MAX:  //  When Mute Button is long-pressed, the previous layers are still active.
+                for (i = 1; i < 5; i++) {
+                    rgb_matrix_set_color(i, RGB_DARKSPRINGGREEN);  //  up(1) down(4) left(3) right(2)  keys
+                }
+                rgb_matrix_set_color(led_single_col_indicator[_KEY02][0], RGB_DARKSPRINGGREEN);   //  TGLTRNS
+                rgb_matrix_set_color(led_single_col_indicator[_KEY04][0], RGB_DARKSPRINGGREEN);   //  TGLINTR
+                rgb_matrix_set_color(led_single_col_indicator[_KEY06][0], RGB_DARKSPRINGGREEN);   //  TGLCHGR
+
+                for (i = 0; i < 3; i++) {
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY01][i], BASE_LAYER_COLOR);   //  B_BASE
+
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY13][i], SEPALEFT_LAYER_COLOR);   //  B_LEFT
+
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY19][i], SEPAHALF_LAYER_COLOR);   //  B_CENTER
+
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY25][i], SEPARIGHT_LAYER_COLOR);   //  B_RIGHT
+
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY37][i], FLIPB_LAYER_COLOR);   //  B_FLIP
+                }
+
+                for (i = _KEY12; i < _KEY37; i+=2){  //  even numbers from _KEY12 to _KEY36 are LED related settings.
+                    // turn on the bottom row only to keep the visibility of the RGB MATRIX effects.
+                    rgb_matrix_set_color(led_single_col_indicator[i][0], RGB_DARKSPRINGGREEN);  //       //  LED related settings.
+                }
+                break;
+        }
+    }
+}
+#endif  // RGB_MATRIX_ENABLE
diff --git a/keyboards/chromatonemini/keymaps/led/readme.md b/keyboards/chromatonemini/keymaps/led/readme.md
new file mode 100644
index 0000000000..ed6cfd6040
--- /dev/null
+++ b/keyboards/chromatonemini/keymaps/led/readme.md
@@ -0,0 +1 @@
+# The LED enabled, customized keymap for chromatonemini
diff --git a/keyboards/chromatonemini/keymaps/led/rules.mk b/keyboards/chromatonemini/keymaps/led/rules.mk
new file mode 100644
index 0000000000..2e67e80675
--- /dev/null
+++ b/keyboards/chromatonemini/keymaps/led/rules.mk
@@ -0,0 +1,3 @@
+RGB_MATRIX_ENABLE = yes     # Use RGB matrix (Don't enable this when RGBLIGHT_ENABLE is used.)
+RGB_MATRIX_CUSTOM_KB = yes  #
+VIA_ENABLE = no             # too many layers to use VIA...
diff --git a/keyboards/chromatonemini/keymaps/party/keymap.c b/keyboards/chromatonemini/keymaps/party/keymap.c
new file mode 100644
index 0000000000..258bfe55c1
--- /dev/null
+++ b/keyboards/chromatonemini/keymaps/party/keymap.c
@@ -0,0 +1,684 @@
+/* Copyright 2021 3araht
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include QMK_KEYBOARD_H
+#include "version.h"
+
+//  define which MIDI ch to use.
+//  Note that (actual MIDI ch# - 1) -> 0 .. 15 is used for coding.
+//  ch1
+#define DEFAULT_MAIN_CH_NUMBER 0
+//  ch3
+#define DEFAULT_SUB_CH_NUMBER  2
+//  ch2
+#define ALT_MAIN_CH_NUMBER     1
+//  ch4
+#define ALT_SUB_CH_NUMBER      3
+static uint8_t midi_left_ch = DEFAULT_SUB_CH_NUMBER;       //  By default, DEFAULT_SUB_CH_NUMBER is used for left side when separated.
+
+//  By default( when use_alt_ch_gr == false), DEFAULT ch group (DEFAULT_MAIN_CH_NUMBER for entirely, or right side when separated, DEFAULT_SUB_CH_NUMBER for left side) is used.
+//  When false, ALT ch group (ALT_MAIN_CH_NUMBER for entirely, or right side when separated, ALT_SUB_CH_NUMBER for left side) is used.
+static bool use_alt_ch_gr = false;
+
+// Defines names for use in layer keycodes and the keymap
+enum layer_names {
+    _BASE,              //  Base layer, shift mode, single channel.
+    _SEPALEFTOCT,       //  1st oct channel separated version. Shift mode.
+    _SEPAHALF,          //  Half channel separated version. Shift mode.
+    _SEPARIGHTOCT,      //  2nd oct channel separated version. Shift mode.
+    _TRANS,             //  Transpose feature is enabled instead of shift mode, single channel.
+    _FLIPBASE,          //  Horizontal flipped version entirely. single channel.
+    _FLIPTRANS,         //  Horizontal flipped version entirely. Transpose is used. single channel.
+    _FN                 //  FuNction layer. This must be at the end of the enumurate to use the range from _LS_FN ... _LS_FN_MAX for FN layer LED settings.
+};
+
+//  Layer State
+#define _LS_BASE           (1UL << _BASE)
+#define _LS_SEPALEFTOCT    (1UL << _SEPALEFTOCT)
+#define _LS_SEPAHALF       (1UL << _SEPAHALF)
+#define _LS_SEPARIGHTOCT   (1UL << _SEPARIGHTOCT)
+#define _LS_FLIPBASE       (1UL << _FLIPBASE)
+
+#define _LS_TRANS          (1UL << _BASE         | 1UL << _TRANS)
+#define _LS_SEPALEFTOCT_T  (1UL << _SEPALEFTOCT  | 1UL << _TRANS)
+#define _LS_SEPAHALF_T     (1UL << _SEPAHALF     | 1UL << _TRANS)
+#define _LS_SEPARIGHTOCT_T (1UL << _SEPARIGHTOCT | 1UL << _TRANS)
+#define _LS_FLIPTRANS      (1UL << _FLIPBASE     | 1UL << _FLIPTRANS)
+
+#define _LS_FN             (1UL << _FN)
+#define _LS_MAX            (_LS_FN << 1)
+
+//  Don't change the DEFAULT_SCALE_COL value below. It must be 0.
+#define DEFAULT_SCALE_COL 0
+static uint8_t scale_indicator_col = DEFAULT_SCALE_COL;
+static bool trans_mode_indicator_loc_sel = true;  // when it is true, the location is _KEY01, _KEY13, ...
+
+//  use led indicator or not.
+static bool led_indicator_enable = true;
+
+// Defines the keycodes used by our macros in process_record_user
+enum custom_keycodes {
+    SHIFT_L = SAFE_RANGE,
+    SHIFT_R,
+    TGLINDI,  //  ToGgLe INDIcator
+    TGLINTR,  //  ToGgLe INdicator location {(_KEY01, _KEY13, _KEY25, _KEY37) or (_KEY02, _KEY14, _KEY26) / (_KEY12, _KEY24, _KEY36)}in TRans mode
+    TGLTRNS,  //  ToGgLe TRaNS and shift
+    TGLCHGR,  //  ToGgLe CH GRoup
+    VERSION,
+
+    B_BASE,            //  border set to the left end.
+    B_LEFT,            //  border set to the 1st left octave.
+    B_CENTER,          //  border set to the center.
+    B_RIGHT,           //  border set to the 1st right octave.
+    B_FLIP,            //  border set to the right end.
+
+    // MY tone for _FLIPHALF and _FLIPLEFTOCT layers to distinguish the notes to avoid sustain effect, etc.
+    // Since they are flipped, their subscripts are not MY_ but YM_, to make them easier to tell.
+    YM_TONE_MIN,
+
+    YM_C = YM_TONE_MIN,
+    YM_Cs,
+    YM_Db = YM_Cs,
+    YM_D,
+    YM_Ds,
+    YM_Eb = YM_Ds,
+    YM_E,
+    YM_F,
+    YM_Fs,
+    YM_Gb = YM_Fs,
+    YM_G,
+    YM_Gs,
+    YM_Ab = YM_Gs,
+    YM_A,
+    YM_As,
+    YM_Bb = YM_As,
+    YM_B,
+
+    YM_C_1,
+    YM_Cs_1,
+    YM_Db_1 = YM_Cs_1,
+    YM_D_1,
+    YM_Ds_1,
+    YM_Eb_1 = YM_Ds_1,
+    YM_E_1,
+    YM_F_1,
+    YM_Fs_1,
+    YM_Gb_1 = YM_Fs_1,
+    YM_G_1,
+    YM_Gs_1,
+    YM_Ab_1 = YM_Gs_1,
+    YM_A_1,
+    YM_As_1,
+    YM_Bb_1 = YM_As_1,
+    YM_B_1,
+
+    YM_C_2,
+    YM_Cs_2,
+    YM_Db_2 = YM_Cs_2,
+    YM_D_2,
+    YM_Ds_2,
+    YM_Eb_2 = YM_Ds_2,
+    YM_E_2,
+    YM_F_2,
+    YM_Fs_2,
+    YM_Gb_2 = YM_Fs_2,
+    YM_G_2,
+    YM_Gs_2,
+    YM_Ab_2 = YM_Gs_2,
+    YM_A_2,
+    YM_As_2,
+    YM_Bb_2 = YM_As_2,
+    YM_B_2,
+
+    YM_C_3,
+    YM_Cs_3,
+    YM_Db_3 = YM_Cs_3,
+    YM_D_3,
+    YM_Ds_3,
+    YM_Eb_3 = YM_Ds_3,
+    YM_E_3,
+    YM_F_3,
+    YM_Fs_3,
+    YM_Gb_3 = YM_Fs_3,
+    YM_G_3,
+    YM_Gs_3,
+    YM_Ab_3 = YM_Gs_3,
+    YM_A_3,
+    YM_As_3,
+    YM_Bb_3 = YM_As_3,
+    YM_B_3,
+
+    YM_C_4,
+    YM_Cs_4,
+    YM_Db_4 = YM_Cs_4,
+    YM_D_4,
+    YM_Ds_4,
+    YM_Eb_4 = YM_Ds_4,
+    YM_E_4,
+    YM_F_4,
+    YM_Fs_4,
+    YM_Gb_4 = YM_Fs_4,
+    YM_G_4,
+    YM_Gs_4,
+    YM_Ab_4 = YM_Gs_4,
+    YM_A_4,
+    YM_As_4,
+    YM_Bb_4 = YM_As_4,
+    YM_B_4,
+
+    YM_C_5,
+    YM_Cs_5,
+    YM_Db_5 = YM_Cs_5,
+    YM_D_5,
+    YM_Ds_5,
+    YM_Eb_5 = YM_Ds_5,
+    YM_E_5,
+    YM_F_5,
+    YM_Fs_5,
+    YM_Gb_5 = YM_Fs_5,
+    YM_G_5,
+    YM_Gs_5,
+    YM_Ab_5 = YM_Gs_5,
+    YM_A_5,
+    YM_As_5,
+    YM_Bb_5 = YM_As_5,
+    YM_B_5,
+
+    YM_C_6,
+    YM_TONE_MAX = YM_C_6
+};
+
+#define MY_TONE_COUNT (YM_TONE_MAX - YM_TONE_MIN + 1)
+static uint8_t my_tone_status[MY_TONE_COUNT];
+
+// Long press: go to _FN layer, tap: MUTE
+#define FN_MUTE LT(_FN, KC_MUTE)
+
+// Used to set octave to MI_OCT_0
+extern midi_config_t midi_config;
+static bool is_trans_mode = false;     //  By default, shift mode is chosen.
+
+static uint8_t key_separator_col = _KEY01;  //  (_KEY01 .. _KEY37).     By default, _KEY01 (= _BASE layer) is chosen. _KEY13 = *LEFT, _KEY19 = *HALF, _KEY25 = *RIGHT, _KEY37 = _FLIPBASE and _FLIPTRANS.
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    /* Base */
+    [_BASE] = LAYOUT(
+            FN_MUTE,         MI_SUS,                             KC_VOLD, KC_VOLU,
+            MI_BENDU,
+        SHIFT_L, SHIFT_R,    MI_C_2, MI_D_2, MI_E_2,  MI_Fs_2, MI_Ab_2, MI_Bb_2, MI_C_3, MI_D_3, MI_E_3, MI_Fs_3, MI_Ab_3, MI_Bb_3, MI_C_4,  MI_D_4,  MI_E_4, MI_Fs_4, MI_Ab_4, MI_Bb_4, MI_C_5,
+            MI_BENDD,           MI_Db_2, MI_Eb_2, MI_F_2,  MI_G_2,  MI_A_2,  MI_B_2, MI_Db_3, MI_Eb_3, MI_F_3,  MI_G_3, MI_A_3,  MI_B_3, MI_Db_4, MI_Eb_4, MI_F_4,  MI_G_4,  MI_A_4,  MI_B_4
+    ),
+
+    /* 1 octave on the left side is ch2, others are ch1 (normal) */
+    [_SEPALEFTOCT] = LAYOUT(
+            _______,          _______,                             _______, _______,
+            _______,
+        SHIFT_L, SHIFT_R,     YM_C_2, YM_D_2, YM_E_2,  YM_Fs_2, YM_Ab_2, YM_Bb_2,     MI_C_3, MI_D_3, MI_E_3, MI_Fs_3, MI_Ab_3, MI_Bb_3, MI_C_4,  MI_D_4,  MI_E_4, MI_Fs_4, MI_Ab_4, MI_Bb_4, MI_C_5,
+            _______,             YM_Db_2, YM_Eb_2, YM_F_2,  YM_G_2,  YM_A_2,  YM_B_2,     MI_Db_3, MI_Eb_3, MI_F_3,  MI_G_3, MI_A_3,  MI_B_3, MI_Db_4, MI_Eb_4, MI_F_4,  MI_G_4,  MI_A_4,  MI_B_4
+    ),
+
+    /* Half ch2, half ch1 (normal) */
+    [_SEPAHALF] = LAYOUT(
+            _______,           _______,                             _______, _______,
+            _______,
+        SHIFT_L, SHIFT_R,      YM_C_2, YM_D_2, YM_E_2,  YM_Fs_2, YM_Ab_2, YM_Bb_2, YM_C_3, YM_D_3, YM_E_3,       MI_Fs_3, MI_Ab_3, MI_Bb_3, MI_C_4,  MI_D_4,  MI_E_4, MI_Fs_4, MI_Ab_4, MI_Bb_4, MI_C_5,
+            _______,               YM_Db_2, YM_Eb_2, YM_F_2,  YM_G_2,  YM_A_2,  YM_B_2, YM_Db_3, YM_Eb_3, YM_F_3,    MI_G_3, MI_A_3,  MI_B_3, MI_Db_4, MI_Eb_4, MI_F_4,  MI_G_4,  MI_A_4,  MI_B_4
+    ),
+
+    /* 2 octave on the left side is ch2, others are ch1 (normal) */
+    [_SEPARIGHTOCT] = LAYOUT(
+            _______,           _______,                             _______, _______,
+            _______,
+        SHIFT_L, SHIFT_R,      YM_C_2, YM_D_2, YM_E_2,  YM_Fs_2, YM_Ab_2, YM_Bb_2, YM_C_3, YM_D_3, YM_E_3, YM_Fs_3, YM_Ab_3, YM_Bb_3,      MI_C_4,  MI_D_4,  MI_E_4, MI_Fs_4, MI_Ab_4, MI_Bb_4, MI_C_5,
+            _______,               YM_Db_2, YM_Eb_2, YM_F_2,  YM_G_2,  YM_A_2,  YM_B_2, YM_Db_3, YM_Eb_3, YM_F_3,  YM_G_3, YM_A_3,  YM_B_3,     MI_Db_4, MI_Eb_4, MI_F_4,  MI_G_4,  MI_A_4,  MI_B_4
+    ),
+
+    /* TRANS   This layer must locate 1 layer below _FN layer. */
+    [_TRANS] = LAYOUT(
+            _______,           _______,                             _______, _______,
+            _______,
+        MI_TRNSD, MI_TRNSU,   _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+            _______,               _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______
+    ),
+
+    /* Flip Base    SFIFTUP and SHIFT_L are swapped. */
+    [_FLIPBASE] = LAYOUT(
+            FN_MUTE,          MI_SUS,                             KC_VOLD, KC_VOLU,
+            MI_BENDU,
+        SHIFT_L, SHIFT_R,     MI_C_5, MI_Bb_4, MI_Ab_4,  MI_Fs_4, MI_E_4, MI_D_4, MI_C_4, MI_Bb_3, MI_Ab_3, MI_Fs_3, MI_E_3, MI_D_3, MI_C_3,  MI_Bb_2,  MI_Ab_2, MI_Fs_2, MI_E_2, MI_D_2, MI_C_2,
+            MI_BENDD,           MI_B_4, MI_A_4, MI_G_4,  MI_F_4,  MI_Eb_4,  MI_Db_4, MI_B_3, MI_A_3, MI_G_3,  MI_F_3, MI_Eb_3,  MI_Db_3, MI_B_2, MI_A_2, MI_G_2,  MI_F_2,  MI_Eb_2,  MI_Db_2
+    ),
+
+    /* Flip Trans   This layer must locate 1 layer above _FLIPBASE layer.  MI_TRNSU and MI_TRNSD are swapped. */
+    [_FLIPTRANS] = LAYOUT(
+            _______,          _______,                             _______, _______,
+            _______,
+        MI_TRNSU, MI_TRNSD,   _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+            _______,               _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______
+    ),
+
+    [_FN] =  LAYOUT(
+            _______,          XXXXXXX,                             RGB_RMOD, RGB_MOD,
+            MI_VELU,
+        MI_OCTD, MI_OCTU,     B_BASE,  XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, B_LEFT, XXXXXXX, XXXXXXX, B_CENTER, XXXXXXX, XXXXXXX, B_RIGHT, XXXXXXX, XXXXXXX, XXXXXXX, VERSION, XXXXXXX, B_FLIP,
+            MI_VELD,               TGLINTR, TGLTRNS, TGLCHGR, XXXXXXX, XXXXXXX, RGB_SAD, RGB_SAI, RGB_HUD, RGB_HUI, RGB_SPD, RGB_SPI, RGB_VAD, RGB_VAI, RGB_RMOD, RGB_MOD, EEP_RST, TGLINDI, RGB_TOG
+    )
+};
+
+// commom codes called from eeconfig_init_user() and keyboard_post_init_user().
+void my_init(void){
+    //  Set octave to MI_OCT_1
+    midi_config.octave = MI_OCT_0 - MIDI_OCTAVE_MIN;
+    // avoid using 127 since it is used as a special number in some sound sources.
+    midi_config.velocity = MIDI_INITIAL_VELOCITY;
+    default_layer_set(_LS_BASE);
+    layer_state_set(_LS_BASE);
+
+#ifdef RGB_MATRIX_ENABLE
+    rgb_matrix_sethsv(HSV_BLUE);
+    //  party mode (for LED soldering test. Enable rainbow color effect, and disable led_indicator to check all LEDs)
+    rgb_matrix_mode(RGB_MATRIX_RAINBOW_MOVING_CHEVRON);
+    led_indicator_enable = false;
+#endif  // RGB_MATRIX_ENABLE
+}
+
+void eeconfig_init_user(void) {  // EEPROM is getting reset!
+    midi_init();
+
+#ifdef RGB_MATRIX_ENABLE
+    rgb_matrix_enable();
+    rgb_matrix_set_speed(RGB_MATRIX_STARTUP_SPD);
+#endif  // RGB_MATRIX_ENABLE
+    my_init(); // commom codes called from eeconfig_init_user() and keyboard_post_init_user().
+}
+
+void keyboard_post_init_user(void) {
+    for (uint8_t i = 0; i < MY_TONE_COUNT; i++) {
+        my_tone_status[i] = MIDI_INVALID_NOTE;
+    }
+    my_init(); // commom codes called from eeconfig_init_user() and keyboard_post_init_user().
+}
+
+void reset_scale_indicator(void) {
+    //  reset transpose value and scale_indicator_col to default.
+    midi_config.transpose = 0;
+    scale_indicator_col = DEFAULT_SCALE_COL;
+    trans_mode_indicator_loc_sel = true;
+}
+
+void reset_all(void) {
+    reset_scale_indicator();
+    is_trans_mode = false;      //  trans mode is disabled by default.
+}
+
+void my_process_midi4single_note(uint8_t channel, uint16_t keycode, keyrecord_t *record, uint8_t *my_tone_status) {
+    uint8_t  mytone    = keycode - YM_TONE_MIN;
+    uint16_t mykeycode = mytone + MIDI_TONE_MIN;
+    // uint16_t mykeycode = keycode - YM_TONE_MIN;
+    // uint8_t  mytone    = mykeycode - MIDI_TONE_MIN;
+    uint8_t  velocity  = midi_config.velocity;
+    // uprintf("keycode=%u,mykeycode=%u,mytone =%u,velo = %u\n", keycode, mykeycode, mytone, velocity);
+    if (record->event.pressed) {
+        if (my_tone_status[mytone] == MIDI_INVALID_NOTE) {
+            uint8_t note = midi_compute_note(mykeycode);
+            midi_send_noteon(&midi_device, channel, note, velocity);
+            dprintf("midi noteon channel:%d note:%d mytone:%d velocity:%d\n", channel, note, mytone, velocity);
+            // uprintf("midi noteon channel:%d note:%d mytone:%d velocity:%d\n", channel, note, mytone, velocity);
+            my_tone_status[mytone] = note;  // store root_note status.
+        }
+    } else {
+        uint8_t note = my_tone_status[mytone];
+        if (note != MIDI_INVALID_NOTE) {
+            midi_send_noteoff(&midi_device, channel, note, velocity);
+            dprintf("midi noteoff channel:%d note:%d velocity:%d\n", channel, note, velocity);
+            // uprintf("midi noteoff channel:%d note:%d velocity:%d\n", channel, note, velocity);
+        }
+        my_tone_status[mytone] = MIDI_INVALID_NOTE;
+    }
+}
+
+void select_layer_state_set(void) {
+    switch (key_separator_col) {
+        case _KEY01:
+            if (is_trans_mode) {
+                layer_state_set(_LS_TRANS);
+            } else {
+                layer_state_set(_LS_BASE);
+            }
+            break;
+
+        case _KEY13:
+            if (is_trans_mode) {
+                layer_state_set(_LS_SEPALEFTOCT_T);
+            } else {
+                layer_state_set(_LS_SEPALEFTOCT);
+            }
+            break;
+
+        case _KEY19:
+            if (is_trans_mode) {
+                layer_state_set(_LS_SEPAHALF_T);
+            } else {
+                layer_state_set(_LS_SEPAHALF);
+            }
+            break;
+
+        case _KEY25:
+            if (is_trans_mode) {
+                layer_state_set(_LS_SEPARIGHTOCT_T);
+            } else {
+                layer_state_set(_LS_SEPARIGHTOCT);
+            }
+            break;
+
+        case _KEY37:
+            if (is_trans_mode) {
+                layer_state_set(_LS_FLIPTRANS);
+            } else {
+                layer_state_set(_LS_FLIPBASE);
+            }
+            break;
+    }
+}
+
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    // uprintf("keycode=%u, YM_C_3=%u, YM_Db_2 =%u, YM_MIN = %u, YM_MAX = %u\n", keycode, YM_C_3, YM_Db_2, YM_TONE_MIN, YM_TONE_MAX);
+    switch (keycode) {
+        case VERSION: // Output firmware info.
+            if (record->event.pressed) {
+                SEND_STRING(QMK_KEYBOARD ":" QMK_KEYMAP " @ " QMK_VERSION " | " QMK_BUILDDATE);
+            }
+            break;
+
+        //  Layer-related settings.
+        //  reset_scale_indicator() first, followed by each modification, and then change the default layer.
+
+        //  1, separator column modification
+        case B_BASE:
+            if (record->event.pressed) {
+                reset_all();
+                key_separator_col = _KEY01;
+                select_layer_state_set();
+            }
+            break;
+
+        case B_LEFT:
+            if (record->event.pressed) {
+                reset_all();
+                key_separator_col = _KEY13;
+                select_layer_state_set();
+            }
+            break;
+
+        case B_CENTER:
+            if (record->event.pressed) {
+                reset_all();
+                key_separator_col = _KEY19;
+                select_layer_state_set();
+            }
+            break;
+
+        case B_RIGHT:
+            if (record->event.pressed) {
+                reset_all();
+                key_separator_col = _KEY25;
+                select_layer_state_set();
+            }
+            break;
+
+        case B_FLIP:
+            if (record->event.pressed) {
+                reset_all();
+                key_separator_col = _KEY37;
+                select_layer_state_set();
+            }
+            break;
+
+        //  2, Toggle scale shift mode and transpose mode
+        case TGLTRNS:
+            if (record->event.pressed) {
+                reset_scale_indicator();
+                is_trans_mode = !is_trans_mode;
+                select_layer_state_set();
+            }
+            break;
+
+        //  SHIFT_L and SHIFT_R can be pressed only when layer is either _BASE, _FLIPBASE.
+        case SHIFT_L:
+            if (record->event.pressed) {
+                switch (layer_state) {
+                    case _LS_BASE:
+                    case _LS_SEPALEFTOCT:
+                    case _LS_SEPAHALF:
+                    case _LS_SEPARIGHTOCT:
+                    case _LS_FLIPBASE:
+                        scale_indicator_col = shift_led_indicator_left(scale_indicator_col);
+                        break;
+                }
+            }
+            break;
+
+        case SHIFT_R:
+            if (record->event.pressed) {
+                switch (layer_state) {
+                    case _LS_BASE:
+                    case _LS_SEPALEFTOCT:
+                    case _LS_SEPAHALF:
+                    case _LS_SEPARIGHTOCT:
+                    case _LS_FLIPBASE:
+                        scale_indicator_col = shift_led_indicator_right(scale_indicator_col);
+                        break;
+                }
+            }
+            break;
+
+        case TGLINDI:
+            if (record->event.pressed) {
+                led_indicator_enable = !led_indicator_enable;
+            }
+            break;
+
+        case TGLINTR:
+            if (record->event.pressed) {
+                switch (layer_state) {
+                    //  main function of the TGLINTR part 1. alternate the status of trans_mode_indicator_loc_sel.
+                    case _LS_TRANS          | (1UL << _FN):
+                    case _LS_SEPALEFTOCT_T  | (1UL << _FN):
+                    case _LS_SEPAHALF_T     | (1UL << _FN):
+                    case _LS_SEPARIGHTOCT_T | (1UL << _FN):
+                        trans_mode_indicator_loc_sel = !trans_mode_indicator_loc_sel;
+
+                        //  when trans_mode_indicator_loc_sel == false, change the scale indicator and transpose.
+                        scale_indicator_col = trans_mode_indicator_loc_sel ? 0:1;
+                        // when TGLINTR is pressed, it also change the initial transpose setting to follow the scale indicator.
+                        if (scale_indicator_col == 1) {
+                            midi_config.transpose = -1;
+                        } else {
+                            midi_config.transpose = 0;
+                        }
+                        break;
+
+                    //  main function of the TGLINTR part 2. alternate the status of trans_mode_indicator_loc_sel.
+                    case _LS_FLIPTRANS      | (1UL << _FN):
+                        trans_mode_indicator_loc_sel = !trans_mode_indicator_loc_sel;
+
+                        //  when trans_mode_indicator_loc_sel == false, change the scale indicator and transpose.
+                        scale_indicator_col = trans_mode_indicator_loc_sel ? 0:11;
+                        // when TGLINTR is pressed, it also change the initial transpose setting to follow the scale indicator.
+                        if (scale_indicator_col == 11) {
+                            midi_config.transpose = -1;
+                        } else {
+                            midi_config.transpose = 0;
+                        }
+                        break;
+
+                    //  special treatment when TGLINTR is pressed in _LS_FLIPBASE layer.
+                    case _LS_FLIPBASE       | (1UL << _FN):   // when in FLIPBASE layer && non-Trans mode, change it to Trans mode.
+                        trans_mode_indicator_loc_sel = false;
+                        scale_indicator_col = 11;
+                        midi_config.transpose = -1;
+                        is_trans_mode = true;
+                        select_layer_state_set();
+                        break;
+
+
+                    //  special treatment when TGLINTR is pressed in other non-Trans layer.
+                    default :  // when other layers = non-Trans mode, change it to Trans mode.
+                        trans_mode_indicator_loc_sel = false;
+                        scale_indicator_col = 1;
+                        midi_config.transpose = -1;
+                        is_trans_mode = true;
+                        select_layer_state_set();
+                }
+            }
+            break;
+
+        case TGLCHGR:
+            if (record->event.pressed) {
+                use_alt_ch_gr = !use_alt_ch_gr;
+                if (use_alt_ch_gr) {
+                    midi_config.channel = ALT_MAIN_CH_NUMBER;
+                    midi_left_ch = ALT_SUB_CH_NUMBER;
+                } else {  //  default
+                    midi_config.channel = DEFAULT_MAIN_CH_NUMBER;
+                    midi_left_ch = DEFAULT_SUB_CH_NUMBER;
+                }
+            }
+            break;
+
+        case  YM_TONE_MIN ... YM_TONE_MAX:  // MY tone
+            // uprintf("keycode=%u, YM_C_3=%u, YM_Db_2 =%u, YM_MIN = %u, YM_MAX = %u\n", keycode, YM_C_3, YM_Db_2, YM_TONE_MIN, YM_TONE_MAX);
+            //  DO NOT THROW BELOW into 'if (record->event.pressed) {}' STATEMENT SINCE IT IS USED IN THE FUNCTION BELOW.
+            my_process_midi4single_note(midi_left_ch, keycode, record, my_tone_status);
+            break;
+    }
+    return true;
+}
+
+#ifdef RGB_MATRIX_ENABLE
+void set_led_scale_indicator(uint8_t r, uint8_t g, uint8_t b) {
+    uint8_t max_scale_indicator_led_loop;
+    uint8_t i;
+    if (led_indicator_enable) {  //  turn on indicators when enabled.
+        max_scale_indicator_led_loop = ( scale_indicator_col == DEFAULT_SCALE_COL ) ? 12 : 9;
+        for (i = 0; i < max_scale_indicator_led_loop; i++) {
+            rgb_matrix_set_color(led_scale_indicator[scale_indicator_col][i], r, g, b);
+        }
+    }
+}
+
+void rgb_matrix_indicators_user(void) {
+    // uint32_t mode = rgblight_get_mode();
+
+    if (rgb_matrix_is_enabled()) {  // turn the lights on when it is enabled.
+
+        // uint8_t max_scale_indicator_led_loop;
+        uint8_t i;
+
+        switch (layer_state) {
+            case _LS_BASE:
+                set_led_scale_indicator(BASE_LAYER_COLOR);
+                break;
+
+            case _LS_FLIPBASE:
+                set_led_scale_indicator(FLIPB_LAYER_COLOR);
+                for (i = 0; i < 3; i++) {
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY37][i], FLIP_BORDER_COLOR);    //  right end
+                }
+                break;
+
+            case _LS_TRANS:
+                set_led_scale_indicator(TRANS_LAYER_COLOR);
+                break;
+
+            case _LS_SEPALEFTOCT_T:
+                set_led_scale_indicator(SEPALEFT_T_LAYER_COLOR);
+                for (i = 0; i < 3; i++) {
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY13][i], FLIP_BORDER_COLOR);    //  Left
+                }
+                break;
+
+            case _LS_SEPAHALF_T:
+                set_led_scale_indicator(SEPAHALF_T_LAYER_COLOR);
+                for (i = 0; i < 3; i++) {
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY19][i], FLIP_BORDER_COLOR);    //  Center
+                }
+                break;
+
+            case _LS_SEPARIGHTOCT_T:
+                set_led_scale_indicator(SEPARIGHT_T_LAYER_COLOR);
+                for (i = 0; i < 3; i++) {
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY25][i], FLIP_BORDER_COLOR);    //  Right
+                }
+                break;
+
+            case _LS_FLIPTRANS:
+                set_led_scale_indicator(FLIPT_LAYER_COLOR);
+                for (i = 0; i < 3; i++) {
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY37][i], FLIP_BORDER_COLOR);    //  right end
+                }
+                break;
+
+            case _LS_SEPALEFTOCT:
+                set_led_scale_indicator(SEPALEFT_LAYER_COLOR);
+                for (i = 0; i < 3; i++) {
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY13][i], FLIP_BORDER_COLOR);    //  Left
+                }
+                break;
+
+            case _LS_SEPAHALF:
+                set_led_scale_indicator(SEPAHALF_LAYER_COLOR);
+                for (i = 0; i < 3; i++) {
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY19][i], FLIP_BORDER_COLOR);    //  Center
+                }
+                break;
+
+            case _LS_SEPARIGHTOCT:
+                set_led_scale_indicator(SEPARIGHT_LAYER_COLOR);
+                for (i = 0; i < 3; i++) {
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY25][i], FLIP_BORDER_COLOR);    //  Right
+                }
+                break;
+
+            case _LS_FN ... _LS_MAX:  //  When Mute Button is long-pressed, the previous layers are still active.
+                for (i = 1; i < 5; i++) {
+                    rgb_matrix_set_color(i, RGB_DARKSPRINGGREEN);  //  up(1) down(4) left(3) right(2)  keys
+                }
+                rgb_matrix_set_color(led_single_col_indicator[_KEY02][0], RGB_DARKSPRINGGREEN);   //  TGLTRNS
+                rgb_matrix_set_color(led_single_col_indicator[_KEY04][0], RGB_DARKSPRINGGREEN);   //  TGLINTR
+                rgb_matrix_set_color(led_single_col_indicator[_KEY06][0], RGB_DARKSPRINGGREEN);   //  TGLCHGR
+
+                for (i = 0; i < 3; i++) {
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY01][i], BASE_LAYER_COLOR);   //  B_BASE
+
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY13][i], SEPALEFT_LAYER_COLOR);   //  B_LEFT
+
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY19][i], SEPAHALF_LAYER_COLOR);   //  B_CENTER
+
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY25][i], SEPARIGHT_LAYER_COLOR);   //  B_RIGHT
+
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY37][i], FLIPB_LAYER_COLOR);   //  B_FLIP
+                }
+
+                for (i = _KEY12; i < _KEY37; i+=2){  //  even numbers from _KEY12 to _KEY36 are LED related settings.
+                    // turn on the bottom row only to keep the visibility of the RGB MATRIX effects.
+                    rgb_matrix_set_color(led_single_col_indicator[i][0], RGB_DARKSPRINGGREEN);  //       //  LED related settings.
+                }
+                break;
+        }
+    }
+}
+#endif  // RGB_MATRIX_ENABLE
diff --git a/keyboards/chromatonemini/keymaps/party/readme.md b/keyboards/chromatonemini/keymaps/party/readme.md
new file mode 100644
index 0000000000..8ca1b5a8ce
--- /dev/null
+++ b/keyboards/chromatonemini/keymaps/party/readme.md
@@ -0,0 +1,6 @@
+# The LED enabled, party mode for testing LED soldering, customized keymap for chromatonemini.
+
+The main differences between "led" and "party" are:  
+//  party mode (for LED soldering test. Enable rainbow color effect, and disable led_indicator to check all LEDs)
+rgb_matrix_mode(RGB_MATRIX_RAINBOW_MOVING_CHEVRON);  
+led_indicator_enable = false;
diff --git a/keyboards/chromatonemini/keymaps/party/rules.mk b/keyboards/chromatonemini/keymaps/party/rules.mk
new file mode 100644
index 0000000000..2e67e80675
--- /dev/null
+++ b/keyboards/chromatonemini/keymaps/party/rules.mk
@@ -0,0 +1,3 @@
+RGB_MATRIX_ENABLE = yes     # Use RGB matrix (Don't enable this when RGBLIGHT_ENABLE is used.)
+RGB_MATRIX_CUSTOM_KB = yes  #
+VIA_ENABLE = no             # too many layers to use VIA...
diff --git a/keyboards/chromatonemini/keymaps/via/config.h b/keyboards/chromatonemini/keymaps/via/config.h
new file mode 100644
index 0000000000..b5ee0ac04b
--- /dev/null
+++ b/keyboards/chromatonemini/keymaps/via/config.h
@@ -0,0 +1,4 @@
+#pragma once
+
+// How many layers to use with VIA / Remap.
+#define DYNAMIC_KEYMAP_LAYER_COUNT 4 // default:4
diff --git a/keyboards/chromatonemini/keymaps/via/keymap.c b/keyboards/chromatonemini/keymaps/via/keymap.c
new file mode 100644
index 0000000000..08613515db
--- /dev/null
+++ b/keyboards/chromatonemini/keymaps/via/keymap.c
@@ -0,0 +1,275 @@
+/* Copyright 2021 3araht
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include QMK_KEYBOARD_H
+#include "version.h"
+
+// Defines names for use in layer keycodes and the keymap
+enum layer_names {
+    _BASE,              //  Base layer, shift mode, single channel.
+    _TRANS,             //  Transpose feature is enabled instead of shift mode, single channel.
+    _RESERVE,           //  RESERVE
+    _FN                 //  FuNction layer. This must be at the end of the enumurate to use the range from _LS_FN ... _LS_FN_MAX for FN layer LED settings.
+};
+
+//  Layer State
+#define _LS_BASE           (1UL << _BASE)
+#define _LS_TRANS          (1UL << _BASE         | 1UL << _TRANS)
+
+#define _LS_FN             (1UL << _FN)
+#define _LS_MAX            (_LS_FN << 1)
+
+//  Don't change the DEFAULT_SCALE_COL value below. It must be 0.
+#define DEFAULT_SCALE_COL 0
+static uint8_t scale_indicator_col = DEFAULT_SCALE_COL;
+static bool trans_mode_indicator_loc_sel = true;  // when it is true, the location is _KEY01, _KEY13, ...
+
+//  use led indicator or not.
+static bool led_indicator_enable = true;
+
+// Defines the keycodes used by our macros in process_record_user
+enum custom_keycodes {
+    SHIFT_L = USER00,
+    SHIFT_R,
+    TGLINDI,  //  ToGgLe INDIcator
+    TGLINTR,  //  ToGgLe INdicator location {(_KEY01, _KEY13, _KEY25, _KEY37) or (_KEY02, _KEY14, _KEY26) / (_KEY12, _KEY24, _KEY36)}in TRans mode
+    TGLTRNS,  //  ToGgLe TRaNS and shift
+
+    B_BASE,            //  border set to the left end.
+    VERSION
+};
+
+// Long press: go to _FN layer, tap: MUTE
+#define FN_MUTE LT(_FN, KC_MUTE)
+
+// Used to set octave to MI_OCT_0
+extern midi_config_t midi_config;
+static bool is_trans_mode = false;     //  By default, shift mode is chosen.
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    /* Base */
+    [_BASE] = LAYOUT(
+            FN_MUTE,         MI_SUS,                             KC_VOLD, KC_VOLU,
+            MI_BENDU,
+        SHIFT_L, SHIFT_R,    MI_C_2, MI_D_2, MI_E_2,  MI_Fs_2, MI_Ab_2, MI_Bb_2, MI_C_3, MI_D_3, MI_E_3, MI_Fs_3, MI_Ab_3, MI_Bb_3, MI_C_4,  MI_D_4,  MI_E_4, MI_Fs_4, MI_Ab_4, MI_Bb_4, MI_C_5,
+            MI_BENDD,           MI_Db_2, MI_Eb_2, MI_F_2,  MI_G_2,  MI_A_2,  MI_B_2, MI_Db_3, MI_Eb_3, MI_F_3,  MI_G_3, MI_A_3,  MI_B_3, MI_Db_4, MI_Eb_4, MI_F_4,  MI_G_4,  MI_A_4,  MI_B_4
+    ),
+
+    /* TRANS   This layer must locate 1 layer below _FN layer. */
+    [_TRANS] = LAYOUT(
+            _______,           _______,                             _______, _______,
+            _______,
+        MI_TRNSD, MI_TRNSU,   _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+            _______,               _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______
+    ),
+
+    /* RESERVE */
+    [_RESERVE] = LAYOUT(
+            _______,          _______,                             _______, _______,
+            _______,
+        _______, _______,      _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+            _______,               _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______
+    ),
+
+    [_FN] =  LAYOUT(
+            _______,          XXXXXXX,                             RGB_RMOD, RGB_MOD,
+            MI_VELU,
+        MI_OCTD, MI_OCTU,     B_BASE, DF(_RESERVE), XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, VERSION, XXXXXXX, XXXXXXX,
+            MI_VELD,              TGLINTR,    TGLTRNS, XXXXXXX, XXXXXXX, XXXXXXX, RGB_SAD, RGB_SAI, RGB_HUD, RGB_HUI, RGB_SPD, RGB_SPI, RGB_VAD, RGB_VAI, RGB_RMOD, RGB_MOD, EEP_RST, TGLINDI, RGB_TOG
+    )
+};
+
+// commom codes called from eeconfig_init_user() and keyboard_post_init_user().
+void my_init(void){
+    //  Set octave to MI_OCT_1
+    midi_config.octave = MI_OCT_0 - MIDI_OCTAVE_MIN;
+    // avoid using 127 since it is used as a special number in some sound sources.
+    midi_config.velocity = MIDI_INITIAL_VELOCITY;
+    default_layer_set(_LS_BASE);
+    layer_state_set(_LS_BASE);
+
+#ifdef RGB_MATRIX_ENABLE
+    rgb_matrix_mode(RGB_MATRIX_CUSTOM_my_solid_reactive_col);
+#endif  // RGB_MATRIX_ENABLE
+}
+
+void eeconfig_init_user(void) {  // EEPROM is getting reset!
+    midi_init();
+
+#ifdef RGB_MATRIX_ENABLE
+    rgb_matrix_enable();
+    rgb_matrix_set_speed(RGB_MATRIX_STARTUP_SPD);
+    rgb_matrix_sethsv(HSV_BLUE);
+#endif  // RGB_MATRIX_ENABLE
+    my_init(); // commom codes called from eeconfig_init_user() and keyboard_post_init_user().
+}
+
+void keyboard_post_init_user(void) {
+    my_init(); // commom codes called from eeconfig_init_user() and keyboard_post_init_user().
+}
+
+void reset_scale_indicator(void) {
+    //  reset transpose value and scale_indicator_col to default.
+    midi_config.transpose = 0;
+    scale_indicator_col = DEFAULT_SCALE_COL;
+    trans_mode_indicator_loc_sel = true;
+}
+
+void reset_all(void) {
+    reset_scale_indicator();
+    is_trans_mode = false;      //  trans mode is disabled by default.
+}
+
+void select_layer_state_set(void) {
+    if (is_trans_mode) {
+        layer_state_set(_LS_TRANS);
+    } else {
+        layer_state_set(_LS_BASE);
+    }
+}
+
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    // uprintf("keycode=%u, YM_C_3=%u, YM_Db_2 =%u, YM_MIN = %u, YM_MAX = %u\n", keycode, YM_C_3, YM_Db_2, YM_TONE_MIN, YM_TONE_MAX);
+    switch (keycode) {
+        case VERSION: // Output firmware info.
+            if (record->event.pressed) {
+                SEND_STRING(QMK_KEYBOARD ":" QMK_KEYMAP " @ " QMK_VERSION " | " QMK_BUILDDATE);
+            }
+            break;
+
+        //  Layer-related settings.
+        //  reset_scale_indicator() first, followed by each modification, and then change the default layer.
+
+        //  1, separator column modification
+        case B_BASE:
+            if (record->event.pressed) {
+                reset_all();
+                select_layer_state_set();
+            }
+            break;
+
+        //  2, Toggle scale shift mode and transpose mode
+        case TGLTRNS:
+            if (record->event.pressed) {
+                reset_scale_indicator();
+                is_trans_mode = !is_trans_mode;
+                select_layer_state_set();
+            }
+            break;
+
+        //  SHIFT_L and SHIFT_R can be pressed only when layer is either _BASE, _FLIPBASE.
+        case SHIFT_L:
+            if (record->event.pressed) {
+                if (layer_state ==  _LS_BASE) {
+                        scale_indicator_col = shift_led_indicator_left(scale_indicator_col);
+                }
+            }
+            break;
+
+        case SHIFT_R:
+            if (record->event.pressed) {
+                if (layer_state == _LS_BASE ) {
+                        scale_indicator_col = shift_led_indicator_right(scale_indicator_col);
+                }
+            }
+            break;
+
+        case TGLINDI:
+            if (record->event.pressed) {
+                led_indicator_enable = !led_indicator_enable;
+            }
+            break;
+
+        case TGLINTR:
+            if (record->event.pressed) {
+                switch (layer_state) {
+                    //  main function of the TGLINTR part 1. alternate the status of trans_mode_indicator_loc_sel.
+                    case _LS_TRANS          | (1UL << _FN):
+                        trans_mode_indicator_loc_sel = !trans_mode_indicator_loc_sel;
+
+                        //  when trans_mode_indicator_loc_sel == false, change the scale indicator and transpose.
+                        scale_indicator_col = trans_mode_indicator_loc_sel ? 0:1;
+                        // when TGLINTR is pressed, it also change the initial transpose setting to follow the scale indicator.
+                        if (scale_indicator_col == 1) {
+                            midi_config.transpose = -1;
+                        } else {
+                            midi_config.transpose = 0;
+                        }
+                        break;
+
+                    //  special treatment when TGLINTR is pressed in other non-Trans layer.
+                    default :  // when other layers = non-Trans mode, change it to Trans mode.
+                        trans_mode_indicator_loc_sel = false;
+                        scale_indicator_col = 1;
+                        midi_config.transpose = -1;
+                        is_trans_mode = true;
+                        select_layer_state_set();
+                }
+            }
+            break;
+    }
+    return true;
+}
+
+#ifdef RGB_MATRIX_ENABLE
+void set_led_scale_indicator(uint8_t r, uint8_t g, uint8_t b) {
+    uint8_t max_scale_indicator_led_loop;
+    uint8_t i;
+    if (led_indicator_enable) {  //  turn on indicators when enabled.
+        max_scale_indicator_led_loop = ( scale_indicator_col == DEFAULT_SCALE_COL ) ? 12 : 9;
+        for (i = 0; i < max_scale_indicator_led_loop; i++) {
+            rgb_matrix_set_color(led_scale_indicator[scale_indicator_col][i], r, g, b);
+        }
+    }
+}
+
+void rgb_matrix_indicators_user(void) {
+    // uint32_t mode = rgblight_get_mode();
+
+    if (rgb_matrix_is_enabled()) {  // turn the lights on when it is enabled.
+
+        // uint8_t max_scale_indicator_led_loop;
+        uint8_t i;
+
+        switch (layer_state) {
+            case _LS_BASE:
+                set_led_scale_indicator(BASE_LAYER_COLOR);
+                break;
+
+            case _LS_TRANS:
+                set_led_scale_indicator(TRANS_LAYER_COLOR);
+                break;
+
+            case _LS_FN ... _LS_MAX:  //  When Mute Button is long-pressed, the previous layers are still active.
+                for (i = 1; i < 5; i++) {
+                    rgb_matrix_set_color(i, RGB_DARKSPRINGGREEN);  //  up(1) down(4) left(3) right(2)  keys
+                }
+                rgb_matrix_set_color(led_single_col_indicator[_KEY02][0], RGB_DARKSPRINGGREEN);   //  TGLTRNS
+                rgb_matrix_set_color(led_single_col_indicator[_KEY04][0], RGB_DARKSPRINGGREEN);   //  TGLINTR
+
+                for (i = 0; i < 3; i++) {
+                    rgb_matrix_set_color(led_single_col_indicator[_KEY01][i], BASE_LAYER_COLOR);   //  B_BASE
+                }
+
+                for (i = _KEY12; i < _KEY37; i+=2){  //  even numbers from _KEY12 to _KEY36 are LED related settings.
+                    // turn on the bottom row only to keep the visibility of the RGB MATRIX effects.
+                    rgb_matrix_set_color(led_single_col_indicator[i][0], RGB_DARKSPRINGGREEN);  //       //  LED related settings.
+                }
+                break;
+        }
+    }
+}
+#endif  // RGB_MATRIX_ENABLE
diff --git a/keyboards/chromatonemini/keymaps/via/readme.md b/keyboards/chromatonemini/keymaps/via/readme.md
new file mode 100644
index 0000000000..2ebbac4431
--- /dev/null
+++ b/keyboards/chromatonemini/keymaps/via/readme.md
@@ -0,0 +1 @@
+# The via keymap for chromatonemini, RGB MATRIX enabled.
diff --git a/keyboards/chromatonemini/keymaps/via/rules.mk b/keyboards/chromatonemini/keymaps/via/rules.mk
new file mode 100644
index 0000000000..3de88c90c8
--- /dev/null
+++ b/keyboards/chromatonemini/keymaps/via/rules.mk
@@ -0,0 +1,3 @@
+RGB_MATRIX_ENABLE = yes     # Use RGB matrix (Don't enable this when RGBLIGHT_ENABLE is used.)
+RGB_MATRIX_CUSTOM_KB = yes  #
+VIA_ENABLE = yes
diff --git a/keyboards/chromatonemini/readme.md b/keyboards/chromatonemini/readme.md
new file mode 100644
index 0000000000..4c018d01a9
--- /dev/null
+++ b/keyboards/chromatonemini/readme.md
@@ -0,0 +1,19 @@
+# chromatonemini
+
+![chromatonemini](https://github.com/3araht/chromatonemini/blob/main/pictures/chromatonemini_toppage.jpg)
+
+chromatonemini keyboard is a simple-design Chromatone mini MIDI keyboard that covers 3 octaves (37 notes).
+
+* Keyboard Maintainer: [3araht](https://github.com/3araht)
+* Hardware Supported: chromatone keyboard, a DIY MIDI keyboard.
+* Hardware Availability: [BOOTH](https://3araht.booth.pm/). Click [here](https://www.tenso.com/en/static/lp_shop_booth) for BOOTH overseas shipping!
+
+Make example for this keyboard (after setting up your build environment):
+
+    make chromatonemini:default
+
+Flashing example for this keyboard:
+
+    make chromatonemini:default:flash
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
diff --git a/keyboards/chromatonemini/rgb_matrix_kb.inc b/keyboards/chromatonemini/rgb_matrix_kb.inc
new file mode 100644
index 0000000000..4fe474e12c
--- /dev/null
+++ b/keyboards/chromatonemini/rgb_matrix_kb.inc
@@ -0,0 +1,58 @@
+#ifdef RGB_MATRIX_KEYREACTIVE_ENABLED
+RGB_MATRIX_EFFECT(my_solid_reactive_multiwide_col)
+RGB_MATRIX_EFFECT(my_solid_reactive_col)
+RGB_MATRIX_EFFECT(my_party_rocks)
+
+#    ifdef RGB_MATRIX_CUSTOM_EFFECT_IMPLS
+
+static HSV my_solid_reactive_multiwide_col_math(HSV hsv, int16_t dx, int16_t dy, uint8_t dist, uint16_t tick) {
+    uint16_t effect = tick + dist;
+    dx              = dx < 0 ? dx * -1 : dx;
+    dx              = dx * 16 > 255 ? 255 : dx * 16;
+    effect += dx;
+    if (effect > 255) effect = 255;
+    hsv.v = qadd8(hsv.v, 255 - effect);
+    // hsv.h += qsub8(130, effect);
+    return hsv;
+}
+
+bool my_solid_reactive_multiwide_col(effect_params_t* params) {
+    return effect_runner_reactive_splash(0, params, &my_solid_reactive_multiwide_col_math);
+}
+
+
+bool my_solid_reactive_col(effect_params_t* params) {
+    RGB_MATRIX_USE_LIMITS(led_min, led_max);
+
+    uint16_t max_tick = 65535 / rgb_matrix_config.speed;
+    for (uint8_t i = led_min; i < led_max; i++) {
+        RGB_MATRIX_TEST_LED_FLAGS();
+        HSV hsv = rgb_matrix_config.hsv;
+        uint16_t tick = max_tick;
+        // Reverse search to find most recent key hit
+        for (int8_t j = g_last_hit_tracker.count - 1; j >= 0; j--) {
+            if (g_last_hit_tracker.x[j] == g_led_config.point[i].x && g_last_hit_tracker.tick[j] < tick) {
+                tick = g_last_hit_tracker.tick[j];
+                break;
+            }
+        }
+
+        uint16_t offset = scale16by8(tick, rgb_matrix_config.speed);
+        hsv.h += qsub8(130, offset);
+        RGB      rgb    = rgb_matrix_hsv_to_rgb(hsv);
+        rgb_matrix_set_color(i, rgb.r, rgb.g, rgb.b);
+    }
+    return led_max < DRIVER_LED_TOTAL;
+}
+
+bool my_party_rocks(effect_params_t* params) {
+    RGB_MATRIX_USE_LIMITS(led_min, led_max);
+    HSV hsv = {rand() & 0xFF, rand() & 0xFF, rgb_matrix_config.hsv.v};
+    RGB rgb = rgb_matrix_hsv_to_rgb(hsv);
+    // rgb_matrix_set_color(i, rgb.r, rgb.g, rgb.b);
+    rgb_matrix_set_color_all(rgb.r, rgb.g, rgb.b);
+    return led_max < DRIVER_LED_TOTAL;
+}
+
+#    endif      // RGB_MATRIX_CUSTOM_EFFECT_IMPLS
+#endif          // RGB_MATRIX_KEYREACTIVE_ENABLED
diff --git a/keyboards/chromatonemini/rules.mk b/keyboards/chromatonemini/rules.mk
new file mode 100644
index 0000000000..29cfc35daf
--- /dev/null
+++ b/keyboards/chromatonemini/rules.mk
@@ -0,0 +1,22 @@
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+BOOTLOADER = caterina
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = no       # Enable Bootmagic Lite
+MOUSEKEY_ENABLE = no        # Mouse keys
+EXTRAKEY_ENABLE = yes       # Audio control and System control
+CONSOLE_ENABLE = no         # Console for debug
+COMMAND_ENABLE = no         # Commands for debug and configuration
+NKRO_ENABLE = no            # Enable N-Key Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
+AUDIO_ENABLE = no           # Audio output
+MIDI_ENABLE = yes           # MIDI support
+ENCODER_ENABLE = yes        # encoder on mute button
+RGB_MATRIX_DRIVER = WS2812  #
+LTO_ENABLE = yes