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Re:30 New OS X Mountain Lion Features in 2 Minutes by jameswyse on Wednesday July 25, 2012 @03:03AM (#4289765)
I tried this feature and couldn't get it to work. I have a (last-gen) airport express and also a mac htpc running airfoil speakers.

I can play to both through iTunes or Airfoil but no audio comes through when using the airplay audio out device. Hopefully this will be addressed soon.

Re:30 New OS X Mountain Lion Features in 2 Minutes by burriko on Wednesday July 25, 2012 @04:37AM (#4289977)
I've used the Airplay audio out a couple of times with a previous generation Airport Express and an AppleTV 2. It works well but does have very noticeable lag, making it useless for anything but playing music. The lag was far greater than that of Airplay mirroring, which I find rather odd.