Hi,
I use Big Muff deluxe bass and suddenly signal stoped passing through the pedal when is bypassed.
When pedal is turned on, everything works normally including red LED.
It could be a dirty switch that can be fixed with a good contact spray like deoxit.
If not please write the techs at info@ehx.com
They can help you out.
The problem was in connection of one wire of ribbon cable which was poorly connected. When I took switch out, all cables suddenly disconnects from the switch PCB. So I desolder rest of old wires, cut a ribbon cable little bit and solder it again and everything works.
