The Electro-Harmonix Stereo Polyphase XO delivers cascading sweeps and gorgeous, panoramic imaging through stereo outputs. User defined start and stop ranges allows you to sculpt the phase shifting to fit your music. Optical circuitry provides a wide dynamic range making the Polyphase ideal for hot output keyboards. Switch selectable LFO, envelope follower and expression pedal control. Generate liquid stereo phase shifting at its finest.