Used Keeley 4 Knob Compressor Effect Pedal

The used Keeley 4 Knob Compressor Effect Pedal delivers studio-grade compression for guitarists seeking precise control and tone clarity. In great condition and fully functional, this pedal features Sustain, Level, Attack, and Clipping controls to fine-tune your sound from subtle dynamic enhancement to full-on squash. Based on the legendary Ross Compressor circuit, it adds rich sustain and smooth tone without compromising your guitar's natural character. Designed and built in the USA, the pedal operates on 9V power and offers true bypass switching for zero tone coloration when not in use. Ideal for clean rhythm tones, solos, or taming high-output pickups, it suits players across genres looking for consistent performance and classic analog compression in a compact, road-ready enclosure.