AMS NEVE 8051 - Manual (Page 9)

Control Link
While the SC link buttons control the audio inputs to
each sidechain, the CV link buttons choose where
the D.C. control voltage generated by each
sidechain is routed. The CV link buttons also
determine which gain makeup control affects each
channel, in the same way that the SC link buttons
assign the threshold controls.
For the output of a sidechain to be correct, it must be
fed back to the channels it is derived from. Pressing
an SC link button will therefore illuminate the
corresponding CV link button and lock it on.
Most compressors apply gain reduction based entirely on the signal level at their inputs. A level
detector examines the input and drives an output VCA that is assumed to have a complimentary
response (a 'feed-forward' system). The 8051 uses a feedback topology, monitoring the output of
each gain cell and continually adjusting the control voltage returned to give the required gain
reduction.
This means that the control voltage linking has to follow sidechain linking to maintain a closed loop.
Once this feedback is in place the sidechain output can be linked to other channels using the
remaining unlit CV link buttons. These channels then follow the same dynamic envelope as the SC
Linked channels, but without their audio content affecting the compression.
A channel may also have control voltage linked from both sidechains. In this case the sidechain
providing the most gain reduction at any moment controls the channel, and the greater of the two
gain makeup settings will be applied.
-
The CV Link buttons are disabled unless either a channel or the key has been routed to the
associated sidechain, or when in external mode.
8051 5.1 Compressor User Guide
Issue 2 Page 7
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