Fireman is based on the legendary amplifier builder's famous distortion pedal. It's a very amp-like distortion pedal with Modern Brown Sound. Nux designed it with 2 independent Volume and Gain control knobs to fit rhythm and solo applications. Fireman 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.