Thanks for the feedback Jim! I might have to move to bus boards at some point, it looks like the CP1As weren't the best choice in any case.
I could get away without the bin seq I think, and I haven't actually pulled the trigger on the voltage block yet -- I would like a bit more CV modulation though and it seems like a good way to both sequence and modulate the rest of the rack. The er301 has tons of internal utility and modulation, including VCAs and so on, it can't send CV out though. You're right though, with the Pulsar in there too the rack has quite a lot of sequencers haha. They're for triggering samples in the ER301 as well as interacting with the visible voice modules.
I'll post another thread to get some feedback on the setup overall though, that's a good idea. Thanks!