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Look up onNote: there is a pop when turning it on initially, doesn't reoccur.From maker's website:Quad-Voice DetunerCreate massive, multi-faceted and shimmering sounds with the Polytope four- voice detuner/chorus/vibrato. The Polytope creates up to four copies of the input signal, which can be detuned in pitch from subtle thickening to huge multi-voice detuned synth sounds. The detuned voices maintain the timbre of the input and respond well to polyphonic signals. In addition to the static detune mode, the included LFO (low frequency oscillator) can be used to sweep the pitches of all four voices to create wide and deep chorus ensembles when combined with the clean signal.

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