Used Keeley 4 Knob Compressor Effect Pedal

The used Keeley 4 Knob Compressor delivers studio-grade compression with controls for Sustain, Level, Attack, and Clipping, allowing precise tone shaping. Ideal for guitar and bass, it enhances clarity, sustain, and punch. This unit is in good condition with typical signs of use but functions perfectly. True bypass design preserves your original signal when disengaged. Powered by a 9V battery or standard center-negative power supply (not included), it’s a reliable choice for any pedalboard.