Compressor Plus

The Keeley Compressor Plus is the most popular boutique compressor in the world, with over 132,000 units built as of 2024. This pedal combines compression with an integrated expander/sustainer that adds gain as notes fade out. The four-knob layout provides Sustain for compression ratio control, Attack for transient response, Blend for parallel compression mixing, and Tone for high-frequency restoration based on vintage analog delay circuits. A Release switch optimizes the response for either single-coil or humbucker pickups. The JFET circuit delivers natural, blooming sustain with hand-matched transistors for consistency. True bypass switching maintains signal purity when off. Built in the USA, the Compressor Plus was named Best Overall Selling Pedal of 2021 by Reverb.com.