I mostly edit in Piano Roll and complete editing instructions are in the Help File. But I don't think editing is causing you not to hear the Playable RealTracks.

Regardless the version of BIAB you have, Playable RealTracks feature works the same.
Here's a link to PG Music's step by step tutorial


Band In A Box Playable RealTracks


BIAB 2025:RB 2025, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.