Boss Super Shifter Pedal Compact pedal with high-quality pitch shifting, Harmonist and tremolo arm effects Intelligent, key-specific pitch shifting of single notes using simple Pitch and Key knobs with scale display Key Shift outputs continuous shifted tone for playing in different keys Detune effect provides slight shifting for fattening a guitar sound Tremolo Arm effect bends single notes up or down to a pre-selected value when pedal is activated, optional expression pedal can be connected for realtime control