...only want to use BIAB for backing tracks when I play the chromatic harmonica
you never told us or explained that in your very first post because that brings up a different search to find what you need/want
here is a quick search of styles plus the underlying RealTracks that you may have without you having to purchase more styles/realtracks that may work for creating backing tracks to play your harmonica
meanwhile i'm sure other's reading your new information will have suggestions or answers