TC Electronic Brainwaves Pitch ShifterBRAINWAVES PITCH SHIFTER Exceptional Pitch Shifter with Studio Grade Algorithms, 4 Octave Dual Voices and Groundbreaking MASH Footswitch State of the art pitch shifter pedal with innovative pressure sensitive footswitch Offers wealth of studio grade algorithms including polyphonic pitch shifting, Whammy style octave up and detune Completely independent dual voice pitch shifting from unison to 2 octaves up or down Revolutionary MASH expression control