Rare, early serial number'd ZVEX proximity volume/tremolo pedal. Hand-built and painted in Minneapolis, MN. Comes with original box and receipt! This is a hopped-up volume pedal with an SHO at its heart, providing boost, and a copper probe plate like a Fuzz Probe. As your foot gets closer, the volume goes up, but unlike a conventional volume pedal, there are no moving parts so you can create instant swells and tremolo effects by tapping your foot on the pedal in time with the band. • MFSKU Trem Probe