http://www.southamptonpedals.com/boosted-fuzz.html
The Boosted Fuzz is Southampton Pedals' take on one of the classic pedal combinations. Featuring a Rangemaster-style circuit as the front end of a Fuzz Face, this pedal provides a versatile fuzz that can go from velcro-ey to saturated and everywhere in between.
By using low-gain silicone transistors, the Boosted Fuzz retains a lot of the sonic characteristics of germanium fuzzes (excellent volume rolloff, smooth clipping, etc) with the stability and cost of a silicone pedal. With the Boost knob on full, the Boosted Fuzz is a full spectrum fuzz that saturates easily. Rolling off the Boost removes bass and mellows out the fuzz. The Bias knob will starve the circuit fully off, creating a velcro fuzz, and will over-saturate the pedal fully on. The three controls are incredibly interactive and can shape the fuzz in countless ways. As with many versatile fuzzes, oscillation will occur in some settings; the Bias knob can be used to 'silence' the pedal.