Found this article and updated my Chrome browser and it works nicely
Chrome 64 would address several user concerns around content that autoplays, most notably, the ability to have autoplay videos go silent by default.
https://www.theverge.com/2017/12/15/...utoplay-videos
Enabled at:
Settings->Advanced->Content Setting->Sound
Need to enter [*.]backpage.com for to get sub-sites as well as main site