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Compression is

used to make things louder

Meaning, you can use it to lift levels in the mix without overwhelming everything else. Most sounds are very “peaky” to begin with, with lots of contrast between the loudest and the softest notes.

Compressors automatically turn down the loudest parts of a sound, and as a result make the average level more consistent. So, you can turn the overall level up in the mix without distorting or “sticking out”.

There can be all kinds of positive side-effects of this process, like making things sound fuller, richer, more controlled or punchier, but at the end of the day it’s all about loudness. Not excessive loudness, but something musically beneficial.

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an audio signal processing operation that reduces the volume of loud sounds or amplifies quiet sounds thus reducing or compressing an audio signal's dynamic range


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Threshold - maximum amplitude (loudness)

Output Gain - added after the compression to get your audio levels back to the correct amplitude

Ratio - how much the compression algorithm is applied

          - as a guide: 2x1 for low compression, 5x1 for medium, and 8 or 9 for strong compression

Attack - how quickly the compression will kick in when it encounters amplitude over the stated threshold

Release - how quickly it lets the compression release



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