The VCA can either use the BA662 or BA6110 chips. The kit comes with BA6110, which means that Q1-4 are also required. If you decide to go with a BA662, do not solder in Q1-4! Also, each chip has a different pinout so use IC15B for BA6110 and IC15A for BA662.
I'm trying to replace a BA662 with the BA6110. I have the BA6110 data sheet and I know the pinout is not the same, but I do not have the BA662 data sheet so I don't know which pin goes where. Using the roland schematic, I tried several combinations that seemed logical and every other 9 pin combination there is to boot.
Then I read the quote above and figured maybe I need some additional components....like a transistor array? What's the deal?