Donner Grey Pitch Guitar Bass Effects Pedals 3 Modes Precise Polyphonic Pitch Shifting Three Modes: Down, Up,and Detune.Switch Mode Among Down (Pitch down): It shifts the pitch and mixes it back with the original signal to create a rich harmonic voice. UP(Pitch up):Outputs a precise polyphonic pitch shifting voice Detune(Slightly pitch shifting): It slightly shifts the pitch and mixes it back with the original Signal to create a chorus-like effect, it brings a lot of nice spacy feel. 2 Oct Pitch Range (16 optional parameters)