Aggregated device with AirPlay @ Mountain Lion

I'm having the same problem as well... have you found a solution yet?

Same problem here. Thanks for logging bug report. Please update this post if you see that it gets resolved.

You could use Airfoil

http://www.rogueamoeba.com/airfoil

advantage: Audio will be in sync with Airfoil.

Disadvantage: $25 license fee.

This really should be fixed by Apple, seems simple enough, multiple outputs works within iTunes, don't see why it can't outside of it.

I have the same problem. I'm trying to stream to my Airport express whilst also playing through the Headphone jack.

Works fine on each if I only select one output but when I select both it doesn't.

Some extra weird behavior to report:

- I did manage to get both outputs to work. For that I had to set the output of the Built-in Output as 2ch-16bit Integer, like the AirPlay output. The sound takes about 3-5 seconds to output (which I attibute to some sort of AirPlay buffering).

- However, the above only worked when I used an emulated AirPlay receiver (using www.airserver.com), but not with an Airport Express.

- In addition, the output was out of sync, which also happened with Airfoil.

OS: 10.8.3

Okay, so I just tore everything apart and moved my airport express because Apple is supposed to be good at making all this work. I could not get it to work, and did a web search with landed me here, and viola, it doesn't work. Maddening.

I'm having the exact same problem.

Tried to set up a multi-output deivce. As with the screenshots Fredd-E posted, selecting "Built-in" by itself, or "Airplay" by itself work fine. When I select both, it only plays through the built-in speakers.

I tried changing the format of built-in to 2ch-16bit integer (without airserver) but it didn't work.

Now trying every combination of settings!?

Any news on the bug report with apple?

Bump

Looks like this is still an issue.

I was able to get around the problem by using Soundflower. I created a multi-output device that included digital out and 2ch Soundflower output. Then I pointed the Soundflower output to Airplay. It works, but there's about 1.5 second delay between the local audio and the airplay output. Still trying to figure out how to buffer this.

The delay is the buffering done by Airplay and you won't be able to circumvent it. Software like rogue amoeba's airfoil delays the video to match the audio.

Check out AU Lab. http://www.apple.com/itunes/mastered-for-itunes/ It's made by Apple. I got it to work and play through 3 devices at the same time. Only problem I've having is that I can't stream to 2 airplay devices at the same time.

This is actually not a bug. To put it simply, what you want to do isn't supported. Not just by Apple, but more so by the software you're using (ie: Spotify).

By checking off both devices, you are effectively creating a single device with 4 outputs: L and R on Mac, L and R on Airplay.

This issue is in telling which audio streams to go to which output, and that level of audio routing is not something that is built into most software. Spotify will just go off of your system default, which will just route the audio to the first 2 outputs it finds (L and R on your Mac in this case).

Even if you could route the audio within Spotify itself, this wouldn't help your issue, because essentially what you're asking for is your 1 stereo audio stream to be copied to all possible outputs. This too is not a supported feature.

You may be wondering at this point "Then what good is this aggregate device option?!"

It's really designed for audio engineers that have several different audio streams and several audio devices connected to their computer. They may want to route audio streams to several different locations, which is why you'll notice that "Configure Speakers" button in your screenshot. Apps like Logic have native support for this and you can do all sorts of routing within it. Setting up an aggregate device allows me to have several pieces of hardware connected to my computer, and instead of having to switch between which one I'm using, I can use all of them at once, and chose different audio to come out of different places (ie: surround sound).

Soundflower is your best bet, as it can easily achieve what you're looking for.

Hope this helps, and if you have any Soundflower questions, let me know.

Actually, nevermind. I found a solution.

Instead of creating an "Aggregate device" you need to create a "Multi-Output Device"

I would have originally mentioned it, but I didn't think this was a feature of Mountain Lion. A quick google search says it indeed is.

Click on the little + on the bottom of the Audio Midi Setup app, choose Multi-Output Device, then check off Built in Output and Airplay. Then you're all set!

Just make sure you set your system output to "Multi-output Device"