Misha,

It's a pity that Realband and you are not on friendlier terms because what you want to accomplish is much easier in Realband.

Because BIAB is not a DAW, it's quite clumsy when it comes to working with multichannel MIDI files and adding Realtracks to the MIDI mix.

Have you had a look at the Realband videos found at the below link? If you want to get the most out of combining you arranger files with Realtracks, it is worth persevering to learn RB (in my opinion).

https://www.pgmusic.com/videos.realband.htm

Regards,
Noel

MY SONGS...
Audiophile BIAB 2024