You always have RealTracks folders, if you loose them due to hard drive fail you just get a replacement.
It's the same deal saving an SGU "Frozen" there are no wav files just section data info.
How do you change a rendered wav FX guitar to Direct Input keeping the same riffs if you want your own FX in the current project ?
How do you change the rendered wav stereo drum track to stems keeping all the same sections ?
You can render sections track anytime to wav/flac but still keep the original sections.

RealBand to NDE (non destructive editing) will save the RealTracks/Drum to WAV/FLAC/WMA instruction data only (no HD space).
If any improvements are made to RealBand, NDE would be the biggest and best move by far.
The BB Plugin now works like this, NO WAVs and instant Gen, even midi only styles are instant as there is no rending down to wav. So it just calls on bbw4_64.exe to generate up just the track data and plays that back direct as in the above Ketron pic, RealBand on the other hand calls on bbw2_64.exe to generate up and render down to consolidated wav.
I don't know why on earth the Delphi generate code from Biab was not put into RealBand's Delphi code rather than having bbw2 in the background, in the first place ??????

RE SUNO, that's why I said about Logic and now for iPad, it has a chord track and AI instruments, I said PG need to get their finger out and see the writing on the wall.