Axiom Home Page Forums General Discussion Home Theater Oppo BDP-83 on the way.

Hey Wheelz, this is from nickboros' link:

Secondary Audio is an optional yak-track that goes with the Blu-ray Picture-in-Picture (PIP) feature. It is mixed in with the main audio so both tracks are audible together. Like BD-Live and excessively complicated menus, it is a marketing-driven Blu-ray feature that no one ever asked for.