<< External Audio File (WAV/WMA/MP3) >>

<< The question is, when I save the SGU/MGU file, what's gonna happen? >>

The audio files are automatically saved and named in the same folder as the SGU/MGU file. See the attached screenshot.

<< What if after saving, I rename these exteral audio files, or move them to a different folder, is there gonna be a problem with the SGU? >>

No. The SGU/MGU file will open and play normally but without loading any of the audio files. It omits them.

<< External MIDI File (.mid)>>

<<This is where I got confused. First I open the piano roll window, turn on snap, then what? Should I drag the file in, or copy the file and paste it in? How should I move it to the desired bar grid like I did with the audio?>>

I've always used copy/paste but only because it's what I first used and I've stuck with it.

<< A Painful Situation >>

This is a more intricate and involved answer that's specific to your workflow and there's many variations, techniques and tools that could apply. I'll study it more and try to develop an answer how I would approach a BIAB only solution.

Attached Files (Click to download or enlarge) (Only available when you are logged in)
Screenshot 2023-02-14 101639.gif (49.5 KB, 174 downloads)
This is a screenshot of a PG Music demo and it's associated files. Note that while external files may be sourced from different programs, PG Music or other, PG Music exclusively finishes and publishes every demo as a BIAB file.
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.