Not sure if this sounds like a switch problem or a input/output jack problem. When the pedal is on it works as it should, but when bypassed the the sound is VERY faint - kind of has a transistor radio sound to it. Sometimes the bypass functions normally, but that's maybe 1 out of 20 times. I've tried doing a search on TGP, but got no where. I'll probably have to wind up sending it back to the manufacturer (it's a Barber pedal, so it should be taken care of), but if it's simpler maybe I have someone locally who can do it for me.