I like quad VCAs that have a "separate" sum/mix output like the Doepfer A-135-1 (if you have the room) and the Bubblesound VCA4p (crowded panel but still patchable even with right angle cables!)
Many quad VCAs have a mix output on channel 4 but channels are subtracted from the mix as you patch into them. I like to run all 4 VCA outputs to separate channels on a stereo mixer for panning and then run the separate VCA mix output to processing modules like delay, reverb, Rings, etc