When editing a scene, underneath the description field you'll see a new checkbox for "no sound." If there is no sound, or if it's all (or mostly) background music, please make sure that box is checked.
I already went through and did a couple hundred scenes that I found. But please check that all your scenes are properly labeled. In your Scenes page, any listing you've already labeled with no sound will have a small note next to it so you know what's been done. There is a new Mass Change option at the bottom to alter a bunch of once.
I did this because although UMD producers were properly mentioning that their vids that had no sound, some customers just don't notice it because not all of them read descriptions, and they will complain to me. It is not enough for me to tell the customer they weren't reading or paying attention. I had to do more.
So with this new data, I can show customers that a scene has no sound via a big prompt right on the info page. And if they have any no-sound item in their carts, UMD will show additional prompts to on their Cart page and again on the Checkout page. It reminds them again on their Purchases page that this particular scene has no sound.