The Homebrew Electronics FMJ Full Metal Jacket is a simple, yet effective distortion pedal. It adds all the gain, sustain, and output you could want without affecting the tone of your guitar or amp. Even order harmonics, jfet based construction, produces a distortion similar to over-driven pre-amp tubes.
Three controls: Gain, Output and Tone.
Two footswitches: On/Off and the Boost, which increases the amount of distortion, making the FMJ like a two channel tube amp. Features true bypass switching (Note: a small pop may occur when the boost is switched). Operates on battery or -9VDC, filtered, and regulated power supply (not included).