Selecting the audio output device in macOS Sierra has never been easier! If you do not have this icon in your menu bar you'll want to open System Preferences and navigate to your Sound settings
From the sound menu, verify that this box is ticked
The volume control icon should now be available in your menu bar. Click the icon to reveal a dropdown of all your available output devices and select the one you wish to use.
The left and right audio ports on the dock will show up as 'USB audio CODEC'. Once you select your preferred output device your MacBook will remember it and always default to that device until you change it.
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