We are not a fan of audio ads and we have them blocked across our network. If you get an ad that is auto-playing audio, it means an advertiser is getting around the filters to serve it.
First, are you logged into WordPress when you're getting these audio ads? Being logged into WordPress interferes with the ad filters, and can cause you to get audio ads that your readers don't get. Try opening your site in a new, private/incognito window and see if it's coming up for you there as well.
If you're still hearing an audio ad, we'll work to locate the advertiser who is serving these ads, and get them blocked. The best way to do this is to grab the ad information by right-clicking on the ad to copy the URL. Just open a ticket or send us an email at email@example.com with that URL so we can work to track it down!