BOSS XS-100 Pitch Shifter with Expresion PedalAdvanced pitch shifting workstation with deep control options and an eight octave range Total pitch control for guitar and bass Class leading pitch shifting quality realized with new BOSS algorithms Clear response and natural feel that retains the fundamental sound character Smooth onboard pedal with integrated toe switch provides linear pitch control across + four octaves Fixed pitch settings in semitone steps across eight octaves for drop tunings,