Replacement for Inter-App Audio?

With iOS Inter-App audio and AUGraph being deprecated (according to the iOS 13 beta Release Notes), how does one expose the existence of an Audio Unit or custom AVAudioNode audio source to another audio destination app, and how does a destination app (recorder, player, and/or visualizer) get sent audio samples from the audio source app (synthesizer or on-screen keyboard)?

Post not yet marked as solved Up vote post of hotpaw2 Down vote post of hotpaw2
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They are pushing AUv3.