Super Tone Control (Wha-Wha) variation
This is a variation of the Super Tone Control to better be controlled by a pedal. The dual ganged potentiometer that controls the frequency can have a value between 10k and 100k ohms. The circuit must be supplied with dual voltage and the OP-amps could be 4136 or TL074. The Q pot varies the resonance of the filter.
Robin Tomtlund