Hi All,
I have been using Band-in-a-Box for many years and currently use Band-in-a-Box 2024 for Windows and the Band-in-a-Box iOS app version 2.0.7 on my iPad.

I have around 60 older songs that I created several years ago (probably with BIAB 2022 or earlier). These include original songs from my band as well as many practice songs.

For each song I have:
• SGU/MGU files
• sometimes MGX files
• matching *_render.m4a files

These songs were carefully customized:
• drums removed or muted in some arrangements
• specific RealTracks selected
• styles adjusted
• many mix and arrangement changes made manually

The rendered M4A files sound exactly as intended.
In older versions of the Band-in-a-Box iOS app these songs worked perfectly:
• the notation and chords were displayed
• the original rendered M4A audio was played

After updating to iOS app version 2.0.7, the notation is still correct, but the app seems to ignore the existing *_render.m4a files and regenerates the accompaniment from the SGU file.
The result is different:
• some styles are replaced
• some RealTracks are different
• the arrangement no longer matches my original rendered version

I also noticed something interesting:
When I use “Open → Local Song” in the iOS app, there is an old file called “your_old_biab_songs.zip” shown with the label “M4A+ Ready”. However, opening this ZIP causes the app to crash. The ZIP is not visible in the iPad Files app, so I cannot inspect its contents. I assume it is an old import created by a previous version of the app.
My questions:
1. Has support for older BB2Go songs with *_render.m4a files changed in the newer iOS app versions?
2. Is there a way to convert or migrate these older songs so the existing rendered M4A audio is preserved and used by the iOS app?
3. Is there a utility in BIAB 2024 Windows (or another method) to embed or link an existing *_render.m4a into the SGU file without rendering the song again?
4. Is “M4A+ Ready” related to this older ZIP import format, and is there a way to recover or convert these songs?

The important point is that I do not want the songs regenerated. The existing M4A files represent the final arrangements I created over many hours and are the performances I want to hear. I only need the iPad app to show the chords and notation while playing the original rendered audio.
Thank you very much for your help.