The Pigtronix Philosopher King is a highly versatile envelope and compression pedal that can give you classic filter tones and lasting sustains or something more unique, like funky distortion and even a polyphonic synthesizer. Make swelling sweeps that fade into oblivion with the Swell and Fade features; with these turned off, however, you find yourself with a totally transparent optical compression. Shape and reshape your sound again and again with the Pigtronix Philosopher King.