Did I miss this? Is it in a new thread?
It's the C/R/C. I just installed three new mastering suites, and hooked my current GSSL test mule into one outboard matrix for listening/evaluation.
The bench figures are about 17dB improvement in the noise floor, but that's just numbers, I wanted to HEAR it...
The outboard matrix in this particular room comprises:
1x Maselec MPL-2 (limiter/De-Esser)
1x GML 9500 Mastering Equalizer (with SEPARATE outboard PSU's for each channel... ludicrously
1x Tube-Tech SMC-2B (multiband compressor/limiter)
1x Manley Masive Passive
Listening tests gave the following result:
The noisiest item in the chain is the Tube-Tech.
The Second nosiest item in the chain is the GML.
The remaining items appear to be all more-or-less equally quiet: they are the Maselec, the Manley and the GSSL.
Without the CRC (I made it 'patchable'), the GSSL was the LOUDEST item in the chain.
Ah...so, here I see CV to SC which lands in the -12v via some resistors, and then CV to VCA...are they the culprits?
I don't think that I understand the question..? Are you asking about which signals crosstalk TO the sidechain CV?
If so, I think it's the lines which go to and from the ratio network, which contain a 'chopped' and 'brutalized' signal, since it's right in the middle of being rectified, and a long way before being smoothed. -And I suspect that they are capacitively-coupled (which means that only the 'sharp transitions' are coupled) into the (very high-Z) input...
Thus the best way to stop it 'spilling' is to make the input look at ground, and stop 'sniffing the air' for interesting-looking waveforms...