Pedal is working and sounds good...all controls work fine. *Proper 12v has been applied. (ACA pedal) *happens w/ both external power & 9v Battery. The ONLY thing that is not working is the LED does not light up when pedal activated. Things I've tried... *Changed out the LED for various other LEDs...Still issue remains. *changed out D3...did not fix issue. Then installed it back.