Set up vocal compression by dialing threshold to even out words, starting near 4:1

Because most singers cannot deliver every word at the same level, some words get buried in the mix; compression evens the level differences so every word is intelligible. A reliable setup procedure: (1) solo the vocal and insert a compressor, starting the ratio at 4:1 - or use a lower 2:1 ratio with more gain reduction for a smoother, less obviously compressed sound; (2) set the threshold for about 2 dB of gain reduction and listen for words that are still less understandable than others, then increase toward ~6 dB and listen again, understanding that the more compression you add, the more you hear the compressor working and coloring the sound; (3) set attack and release so the compressor breathes with the track. The amount varies enormously with vocal style, arrangement, and mic technique: very consistent singers may need only a dB or two, while some vocals take 10 dB or more. When one compressor cannot do it all, engineers serially chain two, or ride the fader/clip-gain by hand for words compression still misses.

Examples

A pop lead that ducks under the band on soft words: start 4:1, threshold for ~2 dB, then push toward 6 dB until every word sits. A breathy intimate vocal: 2:1 with more gain reduction sounds smoother than 4:1. Aggressive modern vocal: 8-10+ dB is common. Some mixers stack two compressors (each doing a few dB) rather than one doing all the work.

Assessment

Set up a compressor on a lead vocal whose loud choruses jump out while quiet verse words disappear. State a starting ratio, how you use gain reduction (in dB) to decide how far to push the threshold, what attack/release you aim for, and what you would do if the compressor alone still leaves a few words buried.