Hi, I recently purchased a used, in new condition, Good Vibes pedal with exactly the same issue, it adds an audible pop to the signal when engaging the foot switch. Likewise, I’ve tried the pedal in different places in the signal chain, including, the effects loop of my Marshall DSL-5C but, the pop is always present when switching in the tremolo or chorus effects.
I’ve spoken to a few people now who have experienced the same problem with this pedal. It would be nice to get some feedback please!? Thanks