The IOUserAudioDevice::SetTransportType() function is what generally sets that icon for your device.

For those of you looking at this with the same problem, the answer was to add: <key>com.apple.security.temporary-exception.iokit-user-client-class</key> <array> <string>IOUserUserClient</string> </array> to the application's entitlement file. Apple is still trying to figure out why the example code didn't work "out-of-the-box". Thanks!