The Rotovibe foot pedal is an electronic rotating speaker simulator allowing you to recreate the background sounds popularized by many artists including Jimi Hendrix. Enhancements include: A redesigned quiet switching system utilizing highly reliable hardware for extended life. Features Vibrato and chorus modes, foot pedal control of modulation speed, knob control of modulation depth, LED modulation speed indicators, effect on/off switch. Standard 1/4" input-output.