Check the listing for details. Electro-Harmonix Pitch Fork Polyphonic Pitch Shifting Guitar Effects Pedal. Condition: New. Listed at 197.80 USD. The Pitch Fork polyphonic pitch shifting guitar effects pedal transposes an instrument's pitch over a +/- three-octave range and features three modes which allow the pitch to be transposed up, down or both, simultaneously. The pitch shift amount can be set to a fixed interval or continuously varied by an expression pedal or control voltage.The controls are straightforward and intuitive. An 11-position Shift switch selects the maximum transposition interval ranging from D (Detune), a shift of 17 cents, through Minor 2nd, Major 2nd, Major 3rd, Perfect 4th, Perfect 5th, Major 6th, Minor 7th, 1 Octave, 2 Octaves and 3 Octaves. A three-position toggle switch controls whether the pitch is transposed up, down or both. In Dual mode, two pitch-shifted signals are output.