Pigtronix Philosopher's RockThe Philosophers 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. Many top slide guitarists have gravitated towards the Philosophers Rock due to its distortion