I want to play iTunes simultaneously on AirPlay (AppleTV) in one room and via the headphone socket into my audio system in another room. I tried selecting the device in the Sound tab in System Preferences but selecting one option just turns off the other. Any ideas?
Airplay – How to Use Simultaneously with Headphones
audio
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Best Answer
iTunes can stream to multiple output devices simultaneously and it's done inside the iTunes app, not the System Preferences.
Here are the steps from Apple Support Page:
Connect your computer, Apple TV, AirPort Express, or other AirPlay-enabled accessory to the same Wi-Fi network.
Open iTunes on your computer.