Electro-Harmonix Good Vibes Modulator Pedal Selectable Chorus or Vibrato delivers classic 1960's tone and vibe. Boosted power rail for extended headroom and definition. Simple control set: Volume, Intensity, Speed knobs. Chorus/Vibrato selector and EXP (Expression Pedal) Speed/Intensity switches. Expression pedal controls Speed or Intensity Rugged, compact die-cast chassis. True Bypass Includes EHX9.6DC power supply