Personal keymap created for OLKB Preonic rev3.

keyboards/preonic/keymaps/mechmaster48/config.h

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+#pragma once
+
+#ifdef AUDIO_ENABLE
+    #define STARTUP_SONG SONG(PREONIC_SOUND)
+    // #define STARTUP_SONG SONG(NO_SOUND)
+
+    #define DEFAULT_LAYER_SONGS { SONG(QWERTY_SOUND), \
+                                  SONG(COLEMAK_SOUND), \
+                                  SONG(DVORAK_SOUND) \
+                                }
+#endif
+
+#define MUSIC_MASK (keycode != KC_NO)
+
+/*
+ * 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.
+*/
+//#define MIDI_ADVANCED
+
+/* override number of MIDI tone keycodes (each octave adds 12 keycodes and allocates 12 bytes) */
+//#define MIDI_TONE_KEYCODE_OCTAVES 2

keyboards/preonic/keymaps/mechmaster48/keymap.c

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+/* Copyright 2021 MechMaster48 admin@mechbox.net
+ *
+ * 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 "muse.h"
+
+enum preonic_layers {
+  _QWERTY,
+  _LOWER,
+  _RAISE,
+  _ADJUST
+};
+
+enum preonic_keycodes {
+  QWERTY = SAFE_RANGE,
+  LOWER,
+  RAISE,
+  BACKLIT
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+/* Qwerty
+ * ,-----------------------------------------------------------------------------------.
+ * |  Esc |   1  |   2  |   3  |   4  |   5  |   6  |   7  |   8  |   9  |   0  | Bksp |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * | Tab  |   Q  |   W  |   E  |   R  |   T  |   Y  |   U  |   I  |   O  |   P  | Del  |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * | Caps |   A  |   S  |   D  |   F  |   G  |   H  |   J  |   K  |   L  |   ;  | Enter|
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * | Shift|   Z  |   X  |   C  |   V  |   B  |   N  |   M  |   ,  |   .  |   /  |  "   |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * | Ctrl | Alt | Gui  | Brite |Lower |    Space    |Raise | Left | Down |  Up  |Right |
+ * `-----------------------------------------------------------------------------------'
+ */
+[_QWERTY] = LAYOUT_preonic_grid(
+  KC_ESC,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_BSPC,
+  KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_DEL,
+  KC_CAPS,  KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_ENT,
+  KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_QUOT,
+  KC_LCTL, KC_LALT, KC_LGUI, BACKLIT, LOWER,   KC_SPC,  KC_SPC,  RAISE,   KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT
+),
+
+/* Lower
+ * ,-----------------------------------------------------------------------------------.
+ * |   ~  |   !  |   @  |   #  |   $  |   %  |   ^  |   &  |   *  |   (  |   )  | Bksp |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * |   ~  |   !  |   @  |   #  |   $  |   %  |   ^  |   &  |   *  |   (  |   )  | Del  |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * | Del  |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |   _  |   +  |   {  |   }  |  |   |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * |      |  F7  |  F8  |  F9  |  F10 |  F11 |  F12 |ISO ~ |ISO | | Home | End  |      |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * |      |      |      |      |      |             |      | Next | Vol- | Vol+ | Play |
+ * `-----------------------------------------------------------------------------------'
+ */
+[_LOWER] = LAYOUT_preonic_grid(
+  KC_TILD, KC_EXLM, KC_AT,   KC_HASH, KC_DLR,  KC_PERC, KC_CIRC, KC_AMPR, KC_ASTR, KC_LPRN, KC_RPRN, KC_BSPC,
+  KC_TILD, KC_EXLM, KC_AT,   KC_HASH, KC_DLR,  KC_PERC, KC_CIRC, KC_AMPR, KC_ASTR, KC_LPRN, KC_RPRN, KC_DEL,
+  KC_DEL,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_UNDS, KC_PLUS, KC_LCBR, KC_RCBR, KC_PIPE,
+  _______, KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,S(KC_NUHS),S(KC_NUBS),KC_HOME, KC_END, _______,
+  _______, _______, _______, _______, _______, _______, _______, _______, KC_MNXT, KC_VOLD, KC_VOLU, KC_MPLY
+),
+
+/* Raise
+ * ,-----------------------------------------------------------------------------------.
+ * |   `  |   1  |   2  |   3  |   4  |   5  |   6  |   7  |   8  |   9  |   0  | Bksp |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * |   `  |   1  |   2  |   3  |   4  |   5  |   6  |   7  |   8  |   9  |   0  | Del  |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * | Del  |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |   -  |   =  |   [  |   ]  |  \   |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * |      |  F7  |  F8  |  F9  |  F10 |  F11 |  F12 |ISO # |ISO / | Pg Up| Pg Dn|      |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * |      |      |      |      |      |             |      | Next | Vol- | Vol+ | Play |
+ * `-----------------------------------------------------------------------------------'
+ */
+[_RAISE] = LAYOUT_preonic_grid(
+  KC_GRV,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_BSPC,
+  KC_GRV,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_DEL,
+  KC_DEL,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_MINS, KC_EQL,  KC_LBRC, KC_RBRC, KC_BSLS,
+  _______, KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  KC_NUHS, KC_NUBS, KC_PGUP, KC_PGDN, _______,
+  _______, _______, _______, _______, _______, _______, _______, _______, KC_MNXT, KC_VOLD, KC_VOLU, KC_MPLY
+),
+
+/* Adjust (Lower + Raise)
+ * ,-----------------------------------------------------------------------------------.
+ * |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |  F7  |  F8  |  F9  |  F10 |  F11 |  F12 |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * |      | Reset| Debug|      |      |      |      |TermOf|TermOn|      |      |  Del |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * |      |      |Aud cy|Aud on|AudOff|AGnorm|AGswap|Qwerty|      |      |      |      |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * |      |Voice-|Voice+|Mus on|MusOff|MidiOn|MidOff|      |      |      |      |      |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * |      |      |      |      |      |             |      |      |      |      |      |
+ * `-----------------------------------------------------------------------------------'
+ */
+[_ADJUST] = LAYOUT_preonic_grid(
+  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,
+  _______, RESET,   DEBUG,   _______, _______, _______, _______, TERM_ON, TERM_OFF,_______, _______, KC_DEL,
+  _______, _______, MU_MOD,  AU_ON,   AU_OFF,  AG_NORM, AG_SWAP, QWERTY,  _______, _______,  _______, _______,
+  _______, MUV_DE,  MUV_IN,  MU_ON,   MU_OFF,  MI_ON,   MI_OFF,  _______, _______, _______, _______, _______,
+  _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______
+)
+
+
+};
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+  switch (keycode) {
+        case QWERTY:
+          if (record->event.pressed) {
+            set_single_persistent_default_layer(_QWERTY);
+          }
+          return false;
+          break;
+        case LOWER:
+          if (record->event.pressed) {
+            layer_on(_LOWER);
+            update_tri_layer(_LOWER, _RAISE, _ADJUST);
+          } else {
+            layer_off(_LOWER);
+            update_tri_layer(_LOWER, _RAISE, _ADJUST);
+          }
+          return false;
+          break;
+        case RAISE:
+          if (record->event.pressed) {
+            layer_on(_RAISE);
+            update_tri_layer(_LOWER, _RAISE, _ADJUST);
+          } else {
+            layer_off(_RAISE);
+            update_tri_layer(_LOWER, _RAISE, _ADJUST);
+          }
+          return false;
+          break;
+        case BACKLIT:
+          if (record->event.pressed) {
+            register_code(KC_RSFT);
+            #ifdef BACKLIGHT_ENABLE
+              backlight_step();
+            #endif
+            #ifdef RGBLIGHT_ENABLE
+              rgblight_step();
+            #endif
+            #ifdef __AVR__
+            writePinLow(E6);
+            #endif
+          } else {
+            unregister_code(KC_RSFT);
+            #ifdef __AVR__
+            writePinHigh(E6);
+            #endif
+          }
+          return false;
+          break;
+      }
+    return true;
+};
+
+bool muse_mode = false;
+uint8_t last_muse_note = 0;
+uint16_t muse_counter = 0;
+uint8_t muse_offset = 70;
+uint16_t muse_tempo = 50;
+
+bool encoder_update_user(uint8_t index, bool clockwise) {
+  if (muse_mode) {
+    if (IS_LAYER_ON(_RAISE)) {
+      if (clockwise) {
+        muse_offset++;
+      } else {
+        muse_offset--;
+      }
+    } else {
+      if (clockwise) {
+        muse_tempo+=1;
+      } else {
+        muse_tempo-=1;
+      }
+    }
+  } else {
+    if (clockwise) {
+      register_code(KC_PGDN);
+      unregister_code(KC_PGDN);
+    } else {
+      register_code(KC_PGUP);
+      unregister_code(KC_PGUP);
+    }
+  }
+    return true;
+}
+
+void dip_switch_update_user(uint8_t index, bool active) {
+    switch (index) {
+        case 0:
+            if (active) {
+                layer_on(_ADJUST);
+            } else {
+                layer_off(_ADJUST);
+            }
+            break;
+        case 1:
+            if (active) {
+                muse_mode = true;
+            } else {
+                muse_mode = false;
+            }
+    }
+}
+
+
+void matrix_scan_user(void) {
+#ifdef AUDIO_ENABLE
+    if (muse_mode) {
+        if (muse_counter == 0) {
+            uint8_t muse_note = muse_offset + SCALE[muse_clock_pulse()];
+            if (muse_note != last_muse_note) {
+                stop_note(compute_freq_for_midi_note(last_muse_note));
+                play_note(compute_freq_for_midi_note(muse_note), 0xF);
+                last_muse_note = muse_note;
+            }
+        }
+        muse_counter = (muse_counter + 1) % muse_tempo;
+    } else {
+        if (muse_counter) {
+            stop_all_notes();
+            muse_counter = 0;
+        }
+    }
+#endif
+}
+
+bool music_mask_user(uint16_t keycode) {
+  switch (keycode) {
+    case RAISE:
+    case LOWER:
+      return false;
+    default:
+      return true;
+  }
+}

keyboards/preonic/keymaps/mechmaster48/readme.md

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+# OLKB Preonic Rev3 layout by mechmaster48
+
+- A simple layout largely based on the default with minor tweaks to fit my typing.
+- The esacpe key has been moved to the top left, ctrl and alt moved to bottom left, and enter key has been moved up one space underneath delete.
+- Colemak and Dvorak layers have been removed in this keymap as I do not and will not use them.
+
+![base layer](https://i.imgur.com/zrmDHXx.gif)
+#------------------------------------------------------
+![lower layer](https://imgur.com/sDEeixE.gif)
+#------------------------------------------------------
+![raise layer](https://imgur.com/bGLukr1.gif)
+#------------------------------------------------------
+![adjust layer](https://imgur.com/UsB87YE.gif)
+#------------------------------------------------------

keyboards/preonic/keymaps/mechmaster48/rules.mk

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+SRC += muse.c