Well too late for me-
BIAB screws up big time with Sierra on my IMAC. Tech support says, "Well sorry You'll have to wait for the patch to come out to fix it--and we dont know when that is."

So they're glad to take my $ and push selling all the updates. I run Digital Performer, et al, with MIDI/audio which is just as complex- probably more- and they stay right on top of new OS updates from Apple. Not BIAB. Just great.
BTW- it wasn't the real tech support I talked to it was chat support because the real tech support is busy developing BIAB 2017 for Windows, so screw the MAC people.