Electro-Harmonix PITCH FORK Polyphonic Pitch Shifter PedalThe Pitch Fork Polyphonic Pitch Shifter Pedal from Electro Harmonix transposes the pitch of your instrument over a range of up to + 3 octaves. Its Mode switch allows the pitch to be transposed up, down, or both simultaneously in Dual mode. The Shift knob has 11 settings, and selects the maximum interval of chromatic transposition: D, m2, M2, M3, P4, P5, M6, m7, 1, 2, and 3. The pitch shift amount can be set to a fixed interval or continuously varied