Electro-Harmonix SLAMMI PLUS Polyphonic Pitch Shifting PedalThe Slammi Plus Polyphonic Pitch Shifter Harmony Pedal from Electro Harmonix transposes your pitch in two different directions over a + 3 octave range (transpose up, down, or both) simultaneously. The 11 position Shift switch selects the maximum transposition starting with D (Detune) which is a shift of 17 cents that creates a chorus or doubling effect. The Dual setting outputs two pitch shifted signals. The first follows the Shift knob as if in UP