Menu > setting > audio & video > audio selection > enable
Now the PiP button at the bottom of the remote turns into an audio select button, so you can switch to sap and back with a button.
No big deal, I'm no hero. But if say you wanted to start a Kickstarter campaign to have a statue of me built at the new stadium, I wouldn't say no.
This should be pinned somewhere under FIOS sap hack. Thank you sir, can't wait to try it next time.