Based upon the German Schaller fuzz of the 60's. Updated to a hybrid germanium and silicon circuit. Lower noise floor and more temperature stability. Tons of low end and volume output on tap. The "texture"� knob changes the character of the fuzz from the chewy compression of the original to a more refined sound, then to a gated sputter. Features include N.O.S. NPN germanium and modern low noise silicon transistors, true bypass switching, 9V power jack, and led indicator. Great for all styles of music.