Yep...if you're more inclined toward "nasty", sound-wise, the Mysteron's the one to keep, to be sure. But there's another killer VCO you'll need to look at: cheap, small, and capable of some really crazed self-mod jazz, and that's Noise Reap's uBermuda. Just recommended them on another build for similar timbral reasons, in fact. A couple of those cost about the same as a typical big-name VCO, and for secondary audio sources (or even up front!), they're a bargain on $$ and hp. Cold Mac? Yeah, that actually makes some sense, but if you want some craziness to pair with it, ADDAC just dropped a very inexpensive device that might pair with it really well as a performance control: the 306 VC Transitions. Check that out. Combining the two of those would set up a very intricate CV morph capability that you can use to affect quite a bit, given what the Cold Mac's designed to do. And yes, the MakeNoise 7U case with the CV Bus is a truly nifty thing...that 1U row solves quite a bit of problems!