An overdrive... with a switchable octave up and clean blend. Who woulda thunk! This is a clone board of the rare Polytone Multivoicer. "The what?". Yeah... new one for us too, but thanks to Mike for bringing this one out of the darkness.
We made a couple of mods to make it a bit more builder and user friendly. The original used the old RC4739 op amps, so we swapped those out for some more common types. We also simplified the switching as well.