PreSonus CL44 - Manual (Page 9)

Bypass
Activating the bypass effectively removes all processing being performed by your CL44 and returns the signal to unity gain.
You should use bypass often when setting up your CL44 to compare the 'before and after' results of the signal processing
affecting your audio signal. Bypass affects both the gate and the compressor. When in Bypass, the Link function is disabled.
Link
Engaging the Link button causes the channel to the left becomes the master controller of both channels. The channel to the
right’s controls become disabled and metering becomes summed left and right, i.e. stereo mode. IMPORTANT: When two
channels are linked (link button pushed in), all of the channel to the right’s controls are inactive.
2.4 PATCH PANEL (BACK)
Input/Output
The input/output jacks are unbalanced tip/sleeve or ring/sleeve connectors or balanced XLR connectors. The XLR
inputs/outputs can handle up to +24dBu unbalanced or balanced.
+4/-10 Switch
This switch adjusts the insert operating level of the sidechain of your CL44 when it is connected to line level (0dB = -10dBV)
gear. With the switch in the '-10' position, the sidechain signal is raised internally. The main audio path is not effected other
than the processing level. When the switch is in the '+4' position, the signal is not changed since this matches the internal
sidechain operating level of your CL44. The +4/-10 does not change the audio level through the CL44.
This function may also be useful in creating special effects with the compressor by 'overcompressing'. It is important to
remember that Pro Gear has a hotter +4 level, whereas consumer gear runs at the lower level of -10.
Flip Button
The Flip Button ‘flips’ the tip and ring (between SEND/IN and RETURN/OUT) on the ¼” jack to match the wiring preference
of your console.
Sidechain Insert
The sidechain jack on each channel interrupts the signal that the compressor is using to detect the audio signal for
processing. When no connector is inserted into this jack, the input signal goes directly to the compressors control circuitry
(normaled). When a connector is inserted into this jack, the signal path is broken. If you have inserted a tip-ring-sleeve
connector, the input signal is sent back out of the CL44 via the ring of the connector. This signal can then be processed by
an equalizer for example to reduce sibilance (de-essing) in a vocal track. The signal is then returned to the unit via the tip
of the connector. The signal sent to the tip could also be that of a narrator or vocalist. In this application, the audio that you
are passing through the compressor will automatically 'duck' when the narrator speaks or vocalist sings.
2.5 POWER