I use BB as my coach (guitar, saxophone etc.) and I do now have some 40 000 songs, but there seems to be some internal limit (100mb) for songs saved in complete form (some 13 000). Is it possible to change this value and what does it actually mean?

To get around the limit you can divide the songs you have into different folders. Then change the home folder that your Song Picker is set to based on what group of songs you wish to view.

It is a setting hard coded into the program. My understanding is 2023 Band-in-a-Box will register up to 40,000 song files.

it doesn't :-(