I was just wondering if you had any details on how you fixed your audio issue. I am experiencing the same issue. Audio plays fine while in the Piper game, but if I play a YouTube video, I hear no sound. I am using the speaker that came with the Piper.
I did notice that the speaker icon in the top right of toolbar is greyed out and has ax x through it. If I click on it the volume slider is greyed out as well. I went Preferences > Audio Device Settings and when I click on that I get a message saying No ASLA Devices Found.
For those following my other threads, we also had this issue before we re-imaged our Piper, just never got around to posting about it. But since we've been getting everything else sorted out, thought I would take a crack at this audio issue.
Any help or advice would be greatly appreciated.