This pedal is a faithful replication of the historical Uni-Vibe foot controller function. Uni-Vibe foot control pedal allows you to transfer the Speed and Effect/Bypass controls from the main unit to the foot controller. When the pedal is plugged into the Pedal Jack on the UV-1's back panel, rocking all the way back sets the Uni-Vibe to bypass (no effect). Rocking forwards turns the effect on and increases the speed. Features: Heavy die-cast zinc housing, a 10-million cycle industrial-grade microswitch, and a high quality connection using standard stereo guitar cables.