qmk_firmware/keyboards/preonic/preonic.c

#include "quantum.h"
#include QMK_KEYBOARD_H

const uint8_t music_map[MATRIX_ROWS][MATRIX_COLS] = LAYOUT_preonic_grid(
  48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59,
  36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
  24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
  12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
   0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11
);

#ifdef ENCODER_ENABLE
bool encoder_update_kb(uint8_t index, bool clockwise) {
    if (!encoder_update_user(index, clockwise)) { return false; }
    if (get_highest_layer(layer_state) > 0) {
        if (clockwise) {
            tap_code_delay(KC_VOLU, 10);
        } else {
            tap_code_delay(KC_VOLD, 10);
        }
    } else {
        if (clockwise) {
            tap_code(KC_PGDN);
        } else {
            tap_code(KC_PGUP);
        }
    }
    return true;
}
#endif