I'll second the importance of having some other CV sources...take a cue from m1sterlurk and look into snagging an SQ-1. At $100 for a 2x8 sequencer with internal clocking and a few other tricks, it's a quick and cheap way to kick the functionality up even further. You can even use sequencers as multistage envelope generators, user-definable VCOs (if you can clock them at audio frequencies), and a bunch of other interesting things, some of which do require a couple of other modules, but hey...they don't call it EuroCRACK for nothin'!