The audio volume for videos is 100% by default whenever a learner opens a new chapter. Would be really handy to have this either set at 50% or 0% to avoid folks having their ears blown out.
Unfortunately reducing volume across all content isn't the greatest solution to this as it reduces the range of volume we can provide to anyone who might be hard of hearing or if we're presenting the course in a demo/group environment.
Basically ... it's better for someone to have to turn the volume up after starting than it is to have them turn it down.