AROMA AHAR-3 Harmonizer Harmonist/Pitch Shifter Electric Guitar Effect Pedal Mini Single Effect with True Bypass Full metal shell;3 controlling knobs and 1 switch are accurate and high sensitive. Mode switch: Switch between up, detune and down mode. Dry knob: Adjust the volume of dry signal. Wet knob: Adjust the volume of wet signal. Range knob: Choose the pitch shift range.