Pigtronix Philosopher"s Rock is a streamlined version of the award-winning Philosopher"s Tone pedal. The Philosopher"s Rock features Pigtronixs unique optical circuit that provides transparent compression with endless clean sustain. This all analog, state-of-the-art dynamics processor is further augmented by a harmonic germanium distortion that can be added via toggle switch for even more over-the-top tones that will instantly melt faces when engaged. Although the Philosophers Rock has fewer controls than its more knobby siblings, it actually sports a 4 times wider range of compression tones on tap. This allows the Philosophers Rock to be used as a more subtle, clean compressor as well as a super squashy sustain machine when maxed out. The Philosophers Rock can be used to tame peaks in your signal as well as to create natural acoustic feedback with or without distortion. Super low noise performance allows the Philosophers Rock to be effective in front of a dirty amp or combined with high gain distortion and fuzz pedals for crafting your personal wall of sound. The Treble and Blend functions from the original Philosophers Tone have been preset to the sweet spot for hassle free operation on stage or in the studio. The Philosophers Rock features true bypass switching and runs fine on standard 9-volt (negative tip) power but ships with an 18-volt adapter for superior headroom, clarity and overall output.Infinite Clean Sustain without noise 100% Analog, optical design Toggle switch for Harmonic Germanium Distortion Ultra wide range of compression tones True Bypass Switching Circuit Design by Howard Davis Sound Design by David Koltai True bypass