OT: Noisy ads
If there's such an ad in the mix from an ad agency, it's likely to be rare enough that you could do 100 page views and not get it. Or it might be on your next click.
I went through all of the ads at one of our agencies and did find one that had audio and deactivated it, but it hadn't had any deliveries yet.
Another agency, who delivered sound and pops previously against my wishes, is the more likely culprit. Their payment performance has been so bad that I dropped them to 1/10th of a percent of our inventory the other day but I just made them zero this morning in case it was them, which it likely was.
Everyone, PM me with any helpful identifying information if you EVER get an ad with sound in it.