Q: Why are the videos muted by default?
If the audio on your videos is muted by default, this is a browser specific setting. Find links below to enable audio for your site. Once audio is enabled in your browser or for your site, this setting will remain, so you should only have to adjust these settings once in your browser.
Here are some helpful instructions for adjusting browser settings:
How to Allow or Block Sites to Play Sound in Google Chrome
What to Do If Firefox Won’t Play Any Sounds
Allow All Auto-Play in Safari (this will allow autoplay videos with sound to play)