mac mini > apple tv: no audio except using itunes The 2014 Mac Mini is connected via ethernet cable to the latest-generation Apple TV, which in turn is connected to the TV via HDMI. Controlling the Mini via Screen Sharing, I start up iTunes, and am able to route its audio to the Apple TV and thence to the TV speakers. However, I'm unable to do this using Swinsian. (Swinsian is just another music player.)

ITunes does have its own widget next to the volume slider for speaker selection


Computer -- Great Room (plus sign)
Great Room -- Available (check mark and volume slider)


which Swinsian doesn't. However, in the menubar there is an "Airplay" widget. It has


Airplay: Great Room -- use as separate display
Airplay to -- Great Room


Number 1 is checked, and I can't switch it to #2.

I've rebooted/restarted each device. No luck. 

How do I send audio from Mac Mini to Apple TV? I don't care one way or another whether the picture of the screen goes to the TV.
To route all sound from the Mac to the Apple TV, option-click the Sound menu in the menu bar on the Mac, and select Apple TV. 

(Note: running Sierra)