ZVEX Wah Probe, Antenna Expression Wah, Hand Painted in Sparkle Blue! #1 of 1! A wah-wah pedal with no rocker pot to wear out, it uses a proximity sensing radio transmitter so you can achieve super fast wah action and chewy sounds (pulling your foot quickly away), and it even has a Super Hard On™ built in so you can drive it to any volume you want. A theremin-style antenna controlling a wah, getting brighter as your foot approaches. It has one extra feature, however. There's a Super Hard-On boost circuit in front of the wah, with a knob to set the exact level of boost for driving your wah sound. • MFSKU WP-PAINTED • UPC 889406430211