The Crazy Tube Circuits Φ (Phi) pedal uses two studio-grade compressors and a hand-selected photocell in a circuit that produces 25 volts of clean headroom from a standard 9-volt supply. Its FET compressor has controls for Attack and Release to sound clean or colored and its parallel compression blends compressed with uncompressed signal. For more, go to crazytubecircuits.com.