Hi all!

I write a macOS DJ app which needs to play to two output devices at the same 
time. I use two AUGraphs: one playing to the system default output, and the 
other playing to a USB device in Hog Mode.

With AUGraph being deprecated in 2018, I'm trying to switch to AVAudioEngine 
and need to know:
What's the correct way to force output to a specific device (*not* the system 
default device)?

In my prototype, I'm getting the AudioUnit for the output node via 
AVAudioEngine.outputNode.audioUnit and then changing 
kAudioOutputUnitProperty_CurrentDevice. This works, but is it intentional or is 
it a side-effect of the current implementation (which may change in the future)?

If this isn't officially supported, would it be more future-proof to use a 
AudioDeviceIOProcID which calls an AVAudioEngine in manual rendering mode?

Thanks!
Ricci Adams
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