HI

I cant get my head around your problem
The set you downloaded only contains piano and guitars

RealTracks Set 299 : Rootsy Blues Guitar & Piano Video Demo
Get ready to shuffle, slide, sway, and shake with the tracks included in RealTracks Set 299: Rootsy Blues Guitar & Piano. This set includes three guitar and two piano tracks. The folk blues guitar is played by non-other than virtuoso Brent Mason, while the blues and ragtime guitar tracks are played by the renaissance man himself - Colin Linden. Add in Mike Rojas on piano and it’s a rootsy blues trio that’s hard to beat!
Note: This RealTracks Set requires Band-in-a-Box® 2018 for Windows or higher.

So what other instruments are you expecting?

Seems to me that what you want is a style that uses these realtracks
But I am a bit confused with calling them instruments and say some are missing.

Your original thoughts in post 2 about that’s what you get sounds right.
Mike

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http://mikesmusic.byethost16.com/