Can't seem to find any information about getting CV out from the VCA envelope. I'm looking at the schematics and have a wild guess that it's somewhere around Q35 maybe?
the VCA has two envelopes - the normal one and the one from the accent, they get "added" together they join at the point where [Q3, Q31, and D27] connect together (also, pin 1 on the BA662 socket)