PreSonus ACP22 - Manual (Page 21)

Basic Setup & Applications
of the speakers and slap you in the face. This is more accentuated when using
digital reverberation on the snare.
Now you can adjust the Gate on the snare to stop those other drums
from 'bleeding' through the snare mic: Turn the gate release knob to about
the middle position, turn the gate attack knob to fully counter-clockwise,
set the gate range to -60dB, adjust the gate threshold slowly clockwise
until you begin to hear those other drums disappearing. Too high of a
threshold setting might disrupt the snares natural sound, too low will let
those other drums open the gate. You need to adjust the gate's threshold and
release to suit your drumming taste.
This simple application applies to any percussive instrument of
course. Experiment...
Limiting.
Limiting is defined as compressing with a ratio of infinity to one.
Sort of like an imaginary ceiling for the level of a signal. On your ACP-22,
limiting occurs when the ratio knob is fully clockwise. At this point, the
threshold knob essentially becomes the 'ceiling' knob for the channel. You
will most likely want an instantaneous attack time while limiting. To achieve
this: Make sure the auto button is out, Turn the attack time knob fully
counter-clockwise and set the compressor's release time for the most
naturally acoustic sound.
(Warning: Improper settings of the release time have been known to cause
pumping, breathing and coughing in limiters. Consult your ears when fine
tuning.)
Compressing bass guitar.
Very similar to compressing vocals, the bass guitar is almost always
compressed or limited during recording. Start with the setting described
above for vocals. Vary the compression ratio, attack and release to suite your
taste.
Compressing acoustic guitar.
It is sometimes easy to over compress an acoustic guitar because
your first impression is that compression sounds awesome on acoustic
instruments. If you're adding the acoustic instrument to a mix that includes