Yes, that would be the MIDI transposes and the RealTracks do not - which of course renders it totally useless.

This shouldn't be "normal" behavior. It is a bug.

If I can type in another RealTrack chord a minor 3rd higher and BIAB has no problem playing that new chord up a m3,
then BIAB can give a "Concert Pitch Adjust" m3 higher automatically as well.
This is necessary to play along with BIAB on alto saxophone (or other transposing instruments) while reading chord names in the proper key for the instrument.
After all, changing the key works fine for RealTracks using the drop down menu for key signatures.

Also, Concert Pitch Adjust – depending on how they implemented it – doesn't necessarily need to do anything at all to audio files.

It's the text displayed on screen that needs to change.
i.e. I tell BIAB concert pitch adjust -9 or +3 (same change: down a M6 or up m3 - just a different octave), and the UI tells the audio rendering engine that I really asked for Eb7 instead of the C7 that I see on screen.

This is a major bug for those of us using BIAB for practicing or teaching of transposing instruments.
I can't require (or even recommend) those students to to buy BIAB as it stands now.