The NUX Fireman is based on the legendary amplifier builder's famous distortion pedal. It's a very amp-like stomp with a modern Brown Sound.Designed with two independent Volume and gain control knobs, the pedal easily fits rhythm and solo applications. The Fireman dual distortion pedal offers a True-bypass / Buffer-bypass toggle switch and a 9V / 18V toggle switch. The 18V position doubles the working voltage inside to give you wider dynamic range.