BOSS XS-1 Pitch Shifter Compact PedalClass leading pitch shifting quality realized with new BOSS algorithms Instantly change the pitch of a guitar, bass, or other instrument Clear response and natural feel that retains the fundamental sound character Change pitch across + seven semitones or + three octaves Balance knob adjusts the mix between the effect and direct sound Detune function (+ 20 cents) to create rich doubling effects Selectable pedal switch modes for toggle or momentary