I understand your wish and support it and give it a plus one.

< Toggle back, it would ignore VSTi on the track and do exactly what it does now. >
I'm sure this is a typo as Partial Regeneration requires a RealTrack.

< Charlie, RB agenda is pushed in BIAB topic as an alternative to BIAB... >

I'm not another member so that should not influence this discussion. I also don't have a RB agenda. It's totally irrelevant to me what software anybody chooses to use. RB is very relevant to this discussion as a DAW irrespective of it's built-in BIAB capabilities. No alternative was needed. BIAB can do this task just fine. The issue is that Tracks View doesn't support the editing without erasing the RealTrack.

It's a DAW just as Cakewalk, Reaper, Studio One, or any number of DAWs members on the Forum use. If this was a discussion about how BIAB midi can be dragged into Cakewalk, I would not have joined this discussion. I just happened to use RB for my demonstration because it's readily available from my desktop.

I agree with you that BIAB should remain the subject's focus So I'll ask for the third time. What's wrong with the current process to edit underlying midi using partial regeneration of a RealTrack from the Tracks View with the moveable Piano Roll open for editing the midi? (This is actually unnecessary as the Partial Regeneration simultaneously updates the underlying midi and RealTrack.) But, you do request the option in your wish, so the attached screenshot shows that both the midi and RealTrack active, visible and editable on the same screen and confirms partial regenerations updates the midi and RealTrack.

Note that the third screenshot shows it is possible to generate and partially regenerate multiple times in just the Track View and choose to save, import or export the underlying midi to your hearts content without ever disabling or erasing the RealTrack.

I saved the underlying midi to new tracks for demonstration. Having the underlying midi visible and editable while using Ctrl-8 Partial regeneration is optional but not necessary. I suggest working and editing the RealTrack edits and partial regenerations until the track is to your liking and only export or save once editing and regenerations have been completed. That may alleviate the need to invent a dual layer view. But, if you post dual layer visibility as a wish, I'll give it my support.

Attached Files (Click to download or enlarge) (Only available when you are logged in)
BIAB 2025:RB 2025, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.