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Maybe you'll find a hint digging thro this: https://github.com/nriley/SoundSource or this ./SoundSource-250.zip since they were able to show the individual devices since 10.5. Unfortunately it's broken since 10.9 :-/
Сервис поддержки клиентов работает на платформе UserEcho
Might be this function: (SoundSource / src / SSAudioDeviceCenter.m : 65)