vckyb6/keymaps/default/keymap.c

 /* Copyright 2020 Bratzworth * 
  * 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

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  [0] = LAYOUT(
    LCA(KC_C),   KC_F11,      LCTL(KC_D), 
    MO(1),       LCTL(KC_E),  LCTL(KC_D)
  ),
  [1] = LAYOUT(
    LCA(KC_C),    KC_F11,          RESET,
    KC_TRNS,      LCTL(KC_E),      KC_MUTE
  )
};

bool encoder_update_user(uint8_t index, bool clockwise) {
  if (clockwise) {
    tap_code(KC_VOLU);
  } else {
    tap_code(KC_VOLD);
  }
  return true;
}