Check the switch itself... they OFTEN get broken mechanically... far more than the electronics failure. Use an ohmmeter to check the switch. Second most common failure is in the power adapters or use of the wrong adapter.
Well the switch does not seem to be the problem, because there's bypass when it is not engaged, and when it does, it only controls the volume up and down, but there's not wah wah at all. Could it be any broken connection of the pot with the rest of the circuit??
Thanks for your help!
mine has the same problem, the volme goes up and down but no wah efect
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