| Great comp. I found instructions on using it on alt.audio.pro.live-sound:
I often get requests for a good Compressor Settings.
Because every Compressor is different in handling Bass Compression
I'm going to pass along this Bass Compression Tip for the
Behringer Composer Pro.
Behringer MDX 2200
Live Performance Bass Settings.
Daisy Chain both halves of the Stereo Compressor by patching channel one
output into channel two input.
Bass>Preamp>Channel 1 Input>Channel 1 Output>Channel 2 Input>Channel 2
Output>Amp
Both Channels:
Expander/Gate: SLOW
Interactive ON
SC Filter: ON
Auto: OFF
I/O Meters set to: OUTPUT
Channel 1:
Expander Gate - (both pots set to "12 noon"):
Threshold: -35, Ratio 2.5, Release: Slow
Threshold - approx. -6.5 db, ]("12:30")
Ratio: 4:1
Attack: 30 ms]
Release: A little faster then ¼ second, i.e., 0.25 ("9:30")
Output:[/b] Boost +3db, ("2:00" max.)
Set Peak Limite to where it barely flashes on your strongest open E slap.
{suggestion @+12, "12:30"} depends on your preamp.
O.K., these seem like reasonable compressor settings.
The magic is in the second channel that maintains dynamics
and raises the headroom thus making the amp louder.
The trick is just "re-compressing" the peaks only.
Therefore the noise floor does not go up and
the remaining high energy peaks are tamed, not limited,
for more headroom without over compressing the dynamic signal.
Channel 2:
Threshold: approx. +6.5 ("2:30")
This Threshold setting allows Channel 1 to duck under this setting
and therefore only the peaks are processed by Channel 2.
Ratio: 4:1
Attack Fastest Setting (1 ms)
Fast Attack times cause "click."
This phenomenon is eliminated by the Attack setting on the Channel 1,
and the Channel 2 Threshold also protects against click.
A very fast Attack is necessary on Channel 2 in order to have the Peaks
acted on a fast as possible, thus extending headroom.
Release: A touch above 0.25 ms.] ("10:30")
Output: ("1:30")
Peak Limiter: to taste...
Or the slightest flash with the the hardest slap on open E
{suggestion @ set at +16 db.}
__________________
Ulrich
DoD #732, U.S. Peavey Club #107, Redneck Bassist Club #14
"On a motorcycle, every sortie is a combat sortie." Gen Lord USAF | 
