Boss CS-3 Compression Sustainer Delay & Reverb It is a modern ribbon

It is a modern ribbon design with no audible diffraction effects or cavity resonance

Tough and compact die-cast chassis

and medium

Quite simply

Boss CS-3 Compression Sustainer Delay & Reverb It is a modern ribbonBoss CS 3 Compression Sustainer Pedal The CS 3 Compression Sustainer pedal compresses louder signals while boosting lower signals, providing smooth sustain without degrading the original sound quality. This is the perfect pedal for guitarists and bassists who want to sound their best. Features: Compact compression sustainer pedal with high quality circuitry Compresses loud signals and boosts softer signals for a smooth overall sound Onboard Level,