The category for routing distinct streams of audio data to different output devices at the same time.
- iOS 6.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
This category can be used for input, output, or both. For example, use this category to route audio to both a USB device and a set of headphones. Use of this category requires a more detailed knowledge of, and interaction with, the capabilities of the available audio routes.