PRESONUS ACP22 User Manual page 26

Appendix
compression destroys the acoustical dynamic response of a
performance. ('Over compression', however, is used by some engineers
as an effect, and with killer results!)
Compressor/limiters are commonly used for many audio applications.
A kick drum can get lost in a wall of electric guitars. No matter how
much level is increased, the kick drum stays 'lost in the mud'. Add a
touch of compression and tighten up that kick drum sound allowing it
to 'punch' through without having to crank the level way up.
A vocal performance usually has a wide dynamic range. Transients
(the very loudest portion of the signal) can be far outside the average
level of the vocal signal. It is extremely difficult to ride the level with
a console fader. A compressor/limiter automatically controls gain
without altering the subtleties of the performance.
A solo guitar can seem to be masked by the rhythm guitars.
Compression can make your 'lead' soar above the track without
shoving the fader through the roof.
Bass guitar can be difficult to record. A consistent level with good
attack can be achieved with proper Compression. Your bass doesn't
have to be washed out in the low end of the mix. Let the
compressor/limiter give your bass the punch it needs to drive the
bottom of the track.