Compressor pedals are required gear for modern guitarists. The sustain and clarity compression brings to your tone makes it essential.The Keeley Compressor is the most popular boutique compressor in the world. Now the Keeley Compressor Plus has enhanced features that are simple and straightforward. Now there is a simple Release Switch that is tuned for single coils or humbuckers. No more wondering if you have the attack or release set right. Your humbuckers will have all the attack and punch that they should. A Tone Control emphasizes the most sensitive harmonics that can be lost in compression, while a Blend Control retains the peaks in your playing and, more importantly, the proper phasing of your guitar signal.The Keeley Compressor Plus is a compressor combined with an expander/sustainer, adding more and more gain as notes fade out. Now you have sustain and compression in one compact pedal!