I just checked and B4II does work in BiaB. But you must set the midi output channel(s) in BiaB to match the B4II input channel. However you will only get one sound, that of the B4II. No drums, strings, bass etc as BiaB can only use one VSTi or DXi at a time. You should be using a sequencer if you want to use multiple VSTs and DXs.

I use Cakewalks TTS-1 as my main sound source in BiaB. I use BiaB as a sketch pad then bring everything into Sonar. I end up modifying most of the BiaB midi files and changing the sound source from the TTS-1 to many other better sounding, IMO, sources.

My momma didn't raise a fool. And if she did it, was one of my brothers.

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware