keymap.c

// ...and the encoder is turned counter-clockwise, send Shift+Tab
const key_override_t encoder_prev_app = ko_make_basic(MOD_MASK_GUI, KC_VOLD, G(S(KC_TAB)));

// ...and the encoder is turned clockwise, send Tab
const key_override_t encoder_next_app = ko_make_basic(MOD_MASK_GUI, KC_VOLU, G(KC_TAB));


// when the Opt key is held...

// ...and the encoder is turned counter-clockwise, send Shift+Cmd+`
const key_override_t encoder_prev_window = ko_make_basic(MOD_BIT(KC_LOPT), KC_VOLD, G(S(KC_GRV)));

// ...and the encoder is turned clockwise, send Cmd+`
const key_override_t encoder_next_window = ko_make_basic(MOD_BIT(KC_LOPT), KC_VOLU, G(KC_GRV));


// when the Ctrl key is held...

// ...and the encoder is turned counter-clockwise, send Shift+Ctrl+Tab
const key_override_t encoder_prev_tab = ko_make_basic(MOD_MASK_CTRL, KC_VOLD, S(C(KC_TAB)));

// ...and the encoder is turned clockwise, send Ctrl+Tab
const key_override_t encoder_next_tab = ko_make_basic(MOD_MASK_CTRL, KC_VOLU, C(KC_TAB));


// This globally defines all key overrides to be used
const key_override_t **key_overrides = (const key_override_t *[]){
    &encoder_prev_tab,
    &encoder_next_tab,
    &encoder_prev_window,
    &encoder_next_window,
    &encoder_prev_app,
    &encoder_next_app,
	NULL // Null terminate the array of overrides!
};