--- /dev/null
+#include "mechmerlin.h"
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+ static uint16_t fnx_layer_timer;
+
+ switch (keycode){
+ case KC_FNX:
+ if(record->event.pressed){
+ fnx_layer_timer = timer_read();
+ layer_on(_FL);
+ } else {
+ layer_off(_FL);
+ if (timer_elapsed(fnx_layer_timer) < 150) {
+ layer_invert(_AL);
+ }
+ }
+ return false;
+ }
+ return true;
+}
\ No newline at end of file