wave

void wave_fx(){
  static byte middle = NUM_LEDS/2;

  currentMillis = millis();
  if(currentMillis - previousMillis >= 10) {
    if (count++ == 255) {
      count = 0;
      }
    for (byte i = 0; i <= middle; i++) {
      wave = sin8((millis() / wave_scale) * i);
      leds[i] = CHSV(ihue, 255, wave);
      }

    for(byte i = middle; i < NUM_LEDS; i++){
      leds[i] = leds[NUM_LEDS - i];
      }
    previousMillis = currentMillis;
    LEDS.show();
  }
}