Compressor

Threshold

Compressor reduces the level of audio that exceeds certain threshold

Lower threshold -> Larger portion of signal will be treated

Reduce only the loudest part of the signal -> Use higher threshold setting

Ratio

Controls strength of the compression

Compression Level	Description
4:1	If input is 4dB over Threshold, Output will be 1dB over threshold
1:1	Input is same as Output (No Compression)
8:1	Every 8dB over Threshold will be reduced to only 1dB over Threshold (Lot of Compression)

Attack

Speed which the compressor reacts once the threshold has been exceeded

Shorter Attack: Make signal reduction quicker

Longer Attack: Have longer gradual increases in reduction

Release

Opposite of Attach

Controls how quickly/slowly level returns to uncompressed once the signal falls back below threshold

Makeup Gain

Output volume control

Used to bring overall level backup

1-Knob Compression

Keep between 9 and 12 o'clock on vocals, keys, and guitars, none on bass

Most useful on vocals

Most people get louder when they sing higher, the compression keeps that reined in.