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Compression
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''Compression'' reduces the dynamic range of a signal. In audio production, compression is often used to limit the peaks on transients, preventing them from clipping when increasing the volume of the master copy. For guitar playing, the main usage is similar, bringing the harsh, percussive spike in volume from the attack of a clean guitar tone so it is more in line with the sustain volume. For clean or mildly distorted guitar, it can be used to get longer sustain or thickness in the tone. It can be used to augment high-gain distortion, so that less distortion can be used without losing thickness - the tone gets clearer without losing saturation.