Hey there Sunguard,
I apologize about the late response, thank you for being patient! Were you able to fix that audio issue? If not, I'd be happy to help out, let me just ask you some questions about what's happening:
I look forward to your response, and if you have any other questions or concerns for me, please let me know!
I tried a bunch of chrome://flags suggestions from way back most of which dont exist anymore. The issue started when I switched to windows 10. I dont see any additional device to change as default. Previously when I casted desktop to chromecast the sound on the computer got muted. Now either they both are muted or arent.