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The Stereo Polyphase Envelope/LFO Phase Shifter from Electro-Harmonix is a phase shifter pedal that uses optocouplers to produce a smooth, liquidy tone that can elevate your playing. Unlike most phase shifters, the Stereo Polyphase Feedback control gives you the ability to vary the sound of the phase shifter. The shifter allows for optimal user control in three modes of operation. In the ENV mode the Stereo Polyphase is a phase shifter controlled by an envelope follower, in the LFO mode the Stereo Polyphase is a phase shifter controlled by a low-frequency oscillator, and in the EXP mode you can use an expression pedal (not included) to control the phase shifter. You may also use an expression pedal in the LFO mode or in the ENV mode to control the range of the phase shifter. You can hook up the Stereo Polyphase in stereo (each output to a separate amp/mixer channel) for a broad stereo image.