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The Keeley Compressor Plus is a compressor with an expander/sustainer. Not only does it act as a regular compressor, limiting the peaks in your playing, it adds more and more gain as notes fade out. Now you have sustain. Nothing worse that a note or a bend that has died before it’s time; the Keeley Compressor Plus adds just the right amount of sustain and expressive bloom to your notes.
The new Release Switch on the Keeley Compressor Plus is designed to make it very easy to transition between single coil and humbucker guitars. Humbuckers have more average energy than single coils and this can cause compressors to stay in “compression mode” for a lot longer. This can make any series of notes you play sound dull. With the quick release of the new Compressor Plus, your humbuckers stay true sounding and each note retains attack and definition.