ZVEX Trem Probe Antenna Expression Volume Hand Painted! ZVEX Trem Probe. Antenna Expression Volume Hand Painted *finish art may vary 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. The Tremolo Probe is a cross between a theremin volume control and a Super Hard-On. Tap on the antenna at any speed and your sound will be a smooth tremolo in time with the band. Rare handpainted ZVEX blast from the past! • MFSKU Tremolo Probe • UPC 855245003275