Can't find utilities on my MacBook Air.
Trying to listen with multiple devices at once, everything says to make an aggregate device however I cannot find the utilities in order to start that process.
MacBook Air, macOS 13.3
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You can open the Utilities folder by going to Finder, then on the menu bar at the top of the screen click the "Go" menu and then click Utilities.
Another method to open the Utilities folder is to use the shift command U key combination.
Once you are in the Utilities folder, use the Audio MIDI Setup application.
Another way to get there is to use Search (magnifying glass icon in menu bar or command space key combination) and then search for Audio MIDI Setup.
Then use the remaining instructions in Create an Aggregate Device to combine multiple audio devices - Apple Support