So, I finally got back to this. I checked the ISP correctly this time, and there are no shorts between the pins. I pulled C17 and checked that again and there isn’t a short there either. With C17 pulled (and the pads with it #%&@!), the pedal has no output at all. I checked all the cable connections and made sure the volume pot was turned up, but there’s no sound. Voltages still read like before, with .45v on R28. I can read a schematic only basically. I know what all the components are and what they are there to do, but I don’t fully grasp how they all interact together. So, my uneducated belief is that the low voltage on R28 could mean that there is a problem with Q3. It might have an internal short, or something. Could this be true? Would you recommend replacing Q3? I cannot find any problems anywhere else in the silencing circuit.
Anyway, I really do appreciate all your help so far.
Thanks,
Peter