It happened in the Colorado game.
Never had an issue in one of my games because it's not a rule in high school. There is a rule about it in the VHSL handbook, but that's for administrators to handle, not officials. I have told PA guys they cannot be on the mic during a live ball. Some think they're supposed to call play-by-play over ther PA like they're calling in on the radio. Nope. I'm not allowing that because the PA might say something like "Fakes the handoff" or "... pitches back to the QB for a flea flicker...." or something else designed to fool the defense. Not having that. There's still no actual penalty other than what's decided by a district or the state based on administrators' reports.
As far as band noise, I love it. Play all you want. If someone has a problem with it, they need to tell the principal or AD.