The base class for nodes that connect to the system's audio input or output.
- iOS 8.0+
- macOS 10.10+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
On iOS, they communicate with the devices appropriate to the app's
AVAudio category, configurations, and user actions, such as connecting or disconnecting external devices.
In the manual rendering mode,
AVAudio perform the input and output in the engine, in response to the client's request.