MSP; "A Primer on Compression" - Peabody Computer Music

IntroductionWhat isCompression?limiters respond to peak levels, and compressors respond to averages.Intermodulation DistortionIntermodulation distortion, or IM, occurs when low frequency signals modulate the level ofhigh frequency signals, or vice versa.This is a pretty raw sound, as it includes components that are the sum of the two frequenciesand the difference between the two frequencies. IM is quite common in electronic circuitsand speakers, but it is usually a fraction of a percent of the original signal. Anything over 1%IM is noticeable, and 3% is downright annoying.6