This pedal receives a clean signal thru when plugging in and unplugging, but when press the button or turn the knobs, the sound does not change. The pedal is not noisy and guitar sound comes thru clearly but no effect is heard at all. Could just be a faulty switch? I have no time or means to take it apart and figure it what’s wrong. Perhaps you can bring it back to life.  Junk for fixing.  Break a string!