The Overload Fuzz is not for the faint of heart! The '?' knob controls the output signal and resend it into the second gain stage of the circuit. What it means anyway... Well expect some audio destruction: loudness, sustain, feedback and noise!
Fun pedal if you're into shoegaze/sludge stuff, get on your knees that turn those knobs.
Build on fuzzdog pcb. Black Sparkle 125B enclosure, top mounted I/O.