Thanks again, Lugia! Based on your post, I think I can learn more from the Disting, so I'll start there and swap in the MScale if I find that the tracking issues are giving me grief. You're right about the hp math not working well with the headphone module in there; as I expand the 1U over time I'll keep in mind that I may want to remove it to optimize the row.
I didn't know what an envelope follower was, but reading about them blew my mind as I hadn't really thought much about that application of modular. I may need to dust off the electric guitar down the line.