Vortex Sound Research

Hi folks, I have no inverters in my rig yet, and not enough attenuators. I'm considering the 4MS SISM, but wondered if there is an alternative that additionally has a CV input on each channel. Which I suppose would make it essentially a VCA that inverts? Mostly I don't want to use the space up for SISM if I could somehow have another 8HP in there for CV control, but maybe I'm way off base here and that should just be done in a separate module? Any advice appreciated!