Hello,

whenever I create and start an AVAudioEngine instance it creates a - seems 
internal - CA aggregate device for whatever reason, the UID always looks 
something like this: CADefaultDeviceAggregate-53257-0

Is there any way to detect if an audio device like this is “private”? When I 
iterate thru available devices thru kAudioHardwarePropertyDevices to make a 
list of available devices which will be shown for the user this device is seems 
to be a valid output, but I’d like to exclude it from that list. What I’m doing 
now is checking out if the device name and the UID is the same, because I found 
this is true for this kind of devices, but there should a better/common way.

Thanks for any thoughts!

Best,
Tamas
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