i actually do it a bit different. I use biab to create the backing tracks ie i create the song,freeze the tracks, and then save down all the tracks as one audio track (stereo) then, I save down each individual tracks of the instruments into a folder. I put the individual tracks into a folder and save them for later. next i take the created song file (stereo wav) and import it into my 4 track. now I have a backing track, and i live record my guitars or vocals. Once done with that i export just the guitar and vocal tracks from my 4 track into the folder with the rest of the individual tracks, and import them all into sonar to do my editing, mixing, mastering ect... the original backing track can then be discarded.... complicated? yes but you have a ton of control over each track, and then you can add in additional midi tracks in sonar...

Biab 2019 ultra pack
Dell laptop I7 running windows 2010
Midi keyboard
Roland BR600 8 track recorder
Sonar X3 producer
flstudio 20