Provides the receiver’s channel map.
- macOS 10.5–10.9Deprecated
The receiver’s audio-channel–to–device–channel mappings.
A channel map correlates a sound’s channels to the output-device’s channels. For example, a two-channel sound being played on a five-channel device should have a channel map to optimize the sound-playing experience. The default map, correlates the first sound channel to the first output channel, the second sound channel to the second output channel, and so on.