AROMA AMO-3 Mario Bit Crusher Electric Guitar Effect Pedal with True Bypass 1/4" Plug Zinc Alloy Connector Mix knob: Adjust the ratio between dry signal and wet signal. Bit knob: Adjust the range of sampling depth reducing. Crush knob: Adjust the range of sampling rate reducing. Mode switch: Switch between low pass, high pass and normal mode. Come with a Connector.