Buzz Audio soc-20 mid side optical compressor - Manual (Page 7)

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Note that unlike some VCA based compressors, all controls remain operational
in LINK A/B mode. You MUST still set up BOTH A and B channel’s controls
usually with identical settings for stereo program (non MS mode), and perhaps
then fine tuned by ear.
MODE STEREO-MID/SIDE
As mentioned earlier, the SOC-20 can be used as two mono compressors and
a stereo mix (left/right) compressor. For these modes, this switch should be in
the up position (STEREO). Note this is a locking toggle and you need to pull out
the lever to operate it.
When switched to MID/SIDE (switch down) the SOC-20 sum and difference
amplifier circuits are engaged. These circuits take the stereo left/right input (as
applied to the Channel A and B Line Input connectors) and generate a sum
signal (audio that is common to left and right) and a difference signal (signals
that are not common). These signals are referred to as MID and SIDE.
The MID signal is fed into Channel A’s compressor and the SIDE signal to
Channel B’s compressor, then back to another set of sum and difference
amplifiers to regenerate the stereo signal. This allows you to compress the MID
and SIDE signals separately and is an extremely powerful tool for processing
stereo sounds. Note the MS mode will only work with stereo signals.
You can monitor the generated MID and SIDE signals with the S/C MON
function (use a patch cord between S/C INSERT SEND and RETURN connectors if
no insert device is connected). The MID and SIDE signals pre-compression are
outputted at the S/C INSERT SEND connectors.
• Please Note! When switching the MODE switch, a large amount of
reconfiguration takes place within the SOC20 audio circuits and this will
cause an audible click. We could have fitted a plethora of coupling
capacitors to reduce this click but this caused to much signal
degradation. The locking toggle prevents accidental operation.
POWER ON
This switches the mains power to the SOC-20 on and off. A yellow led tells you
when it’s on. The SOC bypass relays are engaged for a few seconds at power
up.