I posted a thread already about this, but I wish there was a way to do the realtime tape erase head style erasing of midi notes that is on the MMT-8. As of right now, the biggest setback of the workflow is erasing is limited to erasing the whole track, erasing a note (across the whole track), and erasing a single midi channel out of the track. But what if you want to replace an unwanted section, and for instance it contains notes that are used already in the track?
In general, I feel there is a huge creative benefit to being able to record something, and gradually whittle it down to taste, or to something completely unexpected, by erasing on the fly. I often find myself just re-recording parts just because of a tiny section I wasn't happy with, or recorded just slightly off (like note lengths were off, or realizing I would have rather taken out the snare at the last beat etc.) There isn't a way to go in and edit notes, step by step, wouldn't want that. This is 90% a real-time only device, and I adore it.
I'm not sure how it would be implemented, but I hope that maybe one day it will be!!!