you could kill two birds with one stone using passive LPGs instead of VCAs, if used for handling volume of different layers then LPG are great because you could potentially save on envelopes even, just send a trigger out of LL8 into the LPG voltage control and it should decay with a natural envelope, so you get vca + envelope in a tiny space, for example I bought a couple of takaab's LPG and they are 2hp for 2 LPGs, and it even comes with TONE control, so you can have longer or shorter decays... I've been using these since I got them and I love the sound of it.