I think RealTracks stand on their own as individual entities recorded by a musician so they can be called up separately.

Apart from the fact that there are hundreds of midi only styles which would make lists unacceptably long, i think (and i may be wrong)midi instruments in a style only exist as patterns in the overall style so don't actually exist as separate entities.

the methods i described may seem clunky but after a few tries are quick and easy. i've done it for years and the ability to audition styles in BIAB means you are not shooting blind in your choice of a style from which to pick the midi part you want.