The Diamond Comp/EQ is an optical compressor pedal that builds on the original circuit design while adding expanded control and EQ functionality. It features a custom US-made opto-isolator that delivers smooth, consistent compression suitable for a wide range of playing styles.

An onboard EQ section allows for midrange boost or cut, while a switchable tilt EQ provides tonal flexibility, from brighter, more pronounced compression to a softer, more transparent response. The pedal includes adjustable compression range, an attack switch with LED indicator, and top-mounted input/output jacks for convenient pedalboard placement.