ABSTRACT
A dynamics processor is a device that automatically varies the volume of audio passing
through it. The most common examples are compressors and limiters, which are basically
the same, and noise gates and expanders, which are closely related. Where compressors
reduce the dynamic range, making volume levels more alike, expanders increase dynamics,
making loud parts louder or soft parts even softer. There are also multiband compressors
and expanders that divide the audio into separate frequency bands, then process each band
independently.
