The Stereo Electric Mistress Pedal from Electro-Harmonix is a pedal in which Stereo Flange and Stereo Chorus work together seamlessly to create modulations that undulate and flow over any stage or recording. The Rate knob, the Flanger Depth knob, and the Chorus Depth knob are the three basic controls on the Stereo Electric Mistress. To produce stereo flanges you need to run a second cable from the stereo output into a second amplifier.