Providing a stereo chorus, rich chiming flange, and over the edge effects, the Electro-Harmonix Stereo Polychorus Flanger Guitar Effect Pedal results in signature sounds. The mode selectable analog effects of this guitar effect pedal have chorus, flange, double track, and filter matrix. The double track effect of this Electro-Harmonix polychorus pedal is a short slap back echo while the filter matrix mode of this guitar effect pedal disengages the sweep flange adjustment for manual flange tones. All the effects of the Electro-Harmonix Stereo Polychorus Flanger Guitar Effect Pedal have control over feedback, and tune delay. The Electro-Harmonix polychorus pedal features a sweep filter switch and stereo outputs. The Electro-Harmonix Stereo Polychorus Flanger Guitar Effect Pedal features an improved signal-to-noise ratio.