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In [this article](http://www.pigtronix.com/artists/andy-summers/) written by Andy Summers, he says he uses Pigtronix pedals, both the Philosopher's Tone, and the Quantum Time Modulator. He says, "Thus the arrival of the Philosophers Tone; a small metal box which alchemically transforms electrical current through its ingenious use of transistors, chips and whatever you call those things on the inside, into pure tone. I plug in with joy realizing that with this act I am in the great philosophical continuum and that in fact Descartes was right 'I sustain therefore I am'"more
Michael Wilton uses a Pigtronix Philosopher's Tone Compressor pedal, according to Pigtronix's [website](http://www.pigtronix.com/artists/michael-wilton/).