I would look through all the video tutorials for the new features from version 7 on up. Everything introduced even in those early video's seems to have stuck around, so they really are not outdated. That's what I'm doing and everyday I learn something new that I didn't even know existed in Biab.
Support/videos. The other aspect are the realtracks I think are created sort of in the image of that performer so I don't think they have the flexibility that the original 77 midi styles had which would let you input any chords. Also there is a difference between the default notation and the jazz notation. They input chords differently. I'm not sure if a filter is attached that forces a different reflection of the naming of the chord or either one of the notations is legal. Other people on this can take it further than I can. So hopefully they will continue the conversation