I recently started using my turnip greens pedal again, in a board set up. While toying around I realized that the reverb modes were not switching AT ALL and it seems to be stuck on hall reverb. All the other knobs seem to be in working order (the time and blend knobs), and I tested it out where I took the pedal out from the board and isolated it. I tried different power sources and “amps” (straight into a computer, different amps), but the modes still don’t change. Is there some kind of setup problem I’m having, or is it probably a hardware problem that needs repairing?