Jason,
You you are batting 1,000. HDMI sound is now working.
I am now looking to get a remote that works with XBMC. I have a Windows compatible RC6 remote. I know that is sensed because I can use it to put my NUC to sleep. It will wake up too, but there is no video, so I have to power off.
I also note that the volume controls work in YouTube on Chrome. Any thoughts on that? I love typing Linux commands that I don't understand. Adding those groups was an adventure for a newbie too.
Les