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Compressors usually have controls to set how fast the compressor responds to changes in input level, known as ''attack'', and how quickly the compressor returns to no gain reduction once the input level is below the threshold, known as ''release''. Also, because the compressor is reducing the gain (or level) of the signal, the ability to add a fixed amount of gain at the output is provided so that an optimum level can be used.
Some compressors implement '''sidechaining'''. This feature uses the dynamic level of another input to control the compression level of the signal. This is used by [[disk jockey|disk jockies]] to lower the music volume automatically when speaking, for example (known as ''ducking''). Another use is in music production, to maintain a loud bass track, while still keeping the bass 'out of the way' of the bass drum when the drum hits.
== Companding ==
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