I have a couple questions about aggregate devices.

1. What effect does changing kAudioSubDevicePropertyDriftCompensationQuality 
have? 

2. What quality level does an aggregate device created with Audio MIDI Setup 
use? I don’t see any UI that exposes this property.

3. What happens if drift compensation is enabled on the device that is the 
clock source for the aggregate device?

Audio MIDI Setup’s Help and this support document 
(http://support.apple.com/en-us/HT202000 
<http://support.apple.com/en-us/HT202000>) give different advice for wether or 
not drift compensation should be enabled on the clock source device or not. To 
me it make sense that drift compensation should be DISABLED on the clock source 
device.

The effect of aggregate device properties is very hard to determine via 
experimentation.

— Dominic Feira
Founder, Static Z Software - staticz.com
twitter.com/StaticZSoftware

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