Fishman Powerchip Powerbridge Mixer, Standard Shaft & Standard Length Pot Brand:FISHMAN Fishman is dedicated to helping musicians achieve the truest sound possible whenever they plug in. This Fishman-designed piezo volume control works in conjunction with the exclusive 'Smart Switch' circuit, which automatically splits your piezo and magnetic signals to stereo or mixes them to mono. The Power chip is a miniature onboard Piezo/Magnetic pickup mixing preamp, dedicated to the Fishman Power bridge system.