Can someone from PG Music please chime in here?

There has to be a legal answer, and to be sure PG Music has researched this out the yin-yang.

If there are any cases in which BIAB is considered "third party audio" that could be in violation of any sync licensing rules, no one I know would touch it with a ten-foot pole.

I would like PG to present us with legal definitions and up to date rulings that one can stake a claim on, now that this has been raised.