The ZVEX Fuzz Probe is a kind of cross between a theremin and a fuzz factory. There is a 3 5/8” antenna plate mounted on a chunk of 3/8” clear acrylic that passes over the top of the pedal housing, angles down to sharp turn, and goes back to the pedal. Under the whole mess is a 3 5/8” by 7” sheet of aluminum that provides shielding from annoying ground effects and wires under the stage. It also serves to protect the knobs from being knocked off if you drop it on them... and it makes a nice toe chopper if you are barefoot.
Already, it should be apparent that this is the most dangerous pedal ZVEX has ever made. Ow! The antenna plate projects a field of RF energy that is affected by your foot (or other appendage), altering the circuit that generates it, and in so doing, increasing the brightness of that LED on the top of the pedal and also controllingthe STABILITY (STAB) knob on the back and connected it to the stability knob too. This lets you select your favorite squealy Fuzz Factory™ setting (doesn’t the band love that?) and then mess around with the STAB knob with your foot and create little melodies and interference modulations with your guitar (doesn’t the band love that even more?)