The Boss NS-2 Noise Suppressor is a “must-have” pedal. It eliminates unwanted noise and hum without altering an instrument's natural tone. It's the perfect pedal to quiet down any pedalboard or effects setup. The NS-2 uses an intelligent noise detection circuit that hones in on the sound of noise, so it won't pinch off your natural attacks. In the end you get more tone and less noise.