Danny you are confusing RB with BiaB a tad. RB is a full sequencer, and it does not have to rely on the BiaB styles to generate a song.

In BiaB you get the styles "version" of a song. You can start from a midi file, but it works better to generate a song in the style of. RB and PTPA both will open up and refine midi files. You can add real tracks to them with ease. I do this all the time. Some songs i want the full flavor of the original, and some songs i want it to be my interpretation of the song, so I use the sty;e system.

Some songs i want the drums to sound like the original song so i use a VSTi drum program like jamstix or something, on others i might add a flavor to the song maybe i want it to be a reggae or samba beat so i generate drums with Real Drums.

Lenovo Win 10 16 gig ram, Mac mini with 16 gig of ram, BiaB 2022, Realband, Harrison Mixbus 32c version 9.1324, Melodyne 5 editor, Presonus Audiobox 1818VSL, Presonus control app, Komplete 49 key controller.