I built a Klone (overdrive) a while back that worked and sounded fantastic. However, I'm not having issues with it. I'm using the full schematic. It has the charge pump, buffers, everything's in there.
When I hit the foot switch the pedal it doesn't come on right away, it sort of ramps up to full volume. This means there's some kind of capacitance going on but I'm not sure where. Possibly a short between one of the caps and ground?
Also the pedal was acting up, it would sound a bit low resolution sometimes. Any ideas what could be going on?