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Originally Posted by MR.BYTCH KILLA  What Is A Compressor And What Does It Do To Music?richiebee? |
A compressor is the most abused piece of gear in the recording world. It has numerous functions, to varying degrees, but the basic point is for you to be able to turn up your signal without getting distortion and to level off momentary peaks in a performance. I can't imagine a vocal performance, speech in particular that wouldn't benefit from a touch of compression. There are other creative uses of a compressor...
This article will do a better job of explaining it -
http://en.wikipedia.org/wiki/Audio_level_compression