I used Biab with a Tyros for a few years. You will need a patch map, or use the XG one provided with Biab.

I would make my backing tracks in Biab and export as a midi file. Then I would import the midi file into the software that converted Mega Voices from the midi instruments that matched, forgot the name of it now, but it would add the data needed for the realistic strums, thumps, slaps etc that you get from a Mega Voice.

Once the Mega Voices were converted, I would import into the Tyros and then use it's onboard mixer to add effects and mix the channel volumes to a final file and save.

Or,

With the Tyros 5, you could import an MP3 of a final mix you've created with Biab/RB to play along with, record etc on the 5.

Trax