What is the problem?
Not really a problem, but something that could be useful if one wants to further edit & elaborate the project in a DAW.
Right now we can use the following options:
- export whole song as a single audio file
- export stems, i.e. each track as an audio file
- use the audio-over-USB, which is per-track
One thing characteristic for trackers is that one can trigger multiple different instruments on the same track (e.g. multiple drum one-shot samples, kick & bass to ensure they’re naturally “side-chained”, call & response style riffs, etc.), so one track isn’t necessarily one instrument. Also, from the Amiga days I remember putting sounds on different tracks simply because I was running out of space, so e.g. I’d put some drum hit at the tail end of a pad track, because it was ringing out anyway 
So, having stems or USB audio per-track is great already, but sometime insufficient if you want to process different instruments individually.
What should this feature achieve?
When used, the Mini should render the song per-instrument into separate files:
- 48x sampled instruments
- 3x synths
- 2x return tracks
A nice-to-have thing would be the ability to add selected instruments to custom groups, so that they’re rendered together as a mix (e.g. different bass sound variants, captured as separate samples).
If possible - and I’ve no idea if that’s even technically viable - audio over USB could also have the option to be per-instrument, instead of per-track.
Are there any workarounds?
No AFAIK. Maybe soloing instrument and exporting the song, although I’m not sure that’s even a feature (I think soloing is per-track, not per-instrument)?
Any links to related discussions?
No
Any references to other products?
No