freestompboxes.org

This seems like an extremely cool box. It's the filter from a MS - 20 synth, set to be used as a stompbox controlled by expression pedal. I don't think it's a common item, so gut shots are unlikely, but I was wondering if anyone knew anything about the filter and could make a workalike.

Original pedal
http://www.martoneaudio.com/BrainFreeze.htm

Filter clone schematic
http://www.uni-bonn.de/~uzs159/

Clarification: The schematic is under filters on the left side, as Korg Late MS20.