I use several programs. I'll give more detail when I have more time, but I just now ran a quick test. I exported a big band score to Music XML from Presonus Notion 6, my notation program. BIAB imported only the root and, where present, the root and the slash root. No major, minor, 7, etc nor upper extensions.

Musescore 4 imported the same file and gave me all the correct chords. There was one annoying error: if there were two chords per measure, Musescore showed them both in the first beat, one above the other. But I could at least see the right chords and fix them into the correct place.

So, just from this dead simple 30-second test, I know there is at least one serious problem importing Music XML into BIAB.

By the way, I said this in some thread on the subject, but I've found Musescore to be the most helpful in reading Music XML. Some programs just crash if there is an error in the code. Musescore acts like a compiler; and it will give you an error message where one is detected.

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.