Our 5 Knob Compressor is the pinnacle in the evolution of the Dynacomp/Ross circuit. Yet some people still prefer the lower-fi vintage sound and simplicity of a straight up Ross compressor clone. For those people, we offer the Classic Compressor. It has no modifications, just the standard Sustain and Level knobs. The circuit is true to the original Ross gray compressor and comes with the CA3080E chip and 2N5088 transistors (these are the semi-conductors currently used in the Keeley Compressor). 1% Metal film resistors, polyester metal film caps, a double sided PCB, and Neutrik jacks make this kit a bargain when compared to other Ross clones. And yes, this pedal is true bypass.