via this auction
"Top-quality VCA / MIXER - uses maybe best available VCA chips THAT2180 and OPA2604 in audio chain, TL074 for CV.
Design based on THAT Corp. design notes is simply: just 4 identical VCAs and mixer to mix channels in pairs and all together, each channel has separate out too.
VCAs have logarithmic responce and feed both AC and DC signals.
Normalized to 5V and attenuated by LEVEL pots, CV INs control VCAs gain."
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