Robot Pedal Factory Co. MS-20 Brain-Freeze filter pedal

Rare boutique pedal modeled on the legendary Korg MS-20 analog synth's resonant filter.  Switchable low-pass, high-pass, and band-pass settings.  Use as a hand-swept filter or as a "filter brain" slave to a passive expression pedal or active CV control signal.  Will self-oscillate as only an analog filter can.  Amazing drive circuit that sets the level going into the filter (use to add lovely distortion) and a separate output-volume control.  Very solid construction.  Comes with 16V power supply.