In Sound->Playback Devices I have "HDMI" and "Realtek Digital Output". If I set one, or the other as default device the output switches as expected. I don't see how to enable both, however (something that we take for granted for analog sources!). I was told this is in Windows 7 "by design". Any confirmation, refutation?
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More aboutenable sound outputs simultaneously
I tried for a long time to find a way to get 2 playback devices to work simultaneously and have failed. I've got 'Speakers' and 'Realtek Digital Output' & i can only have on or the other output sound.