How? I'm on 10.8.4, and in the 'Sound' preferences panel the only option I can see is to route all sound out to a single Airplay device (I can't multi-select more than one Airplay device).
Typical use case for me using Airfoil: Send Spotify output to an AppleTV, and a couple Airport Express devices, while all other apps send their output to my Mac's speakers.
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How? I'm on 10.8.4, and in the 'Sound' preferences panel the only option I can see is to route all sound out to a single Airplay device (I can't multi-select more than one Airplay device).
Typical use case for me using Airfoil: Send Spotify output to an AppleTV, and a couple Airport Express devices, while all other apps send their output to my Mac's speakers.