The current rate of playback.
- watchOS 2.0–6.0Deprecated
The playback rate refers to the playback speed. A value of
0 indicates that playback is paused while a value of
1 indicates playback is proceeding at the natural rate of the item. Rates other than
1 let you play the audio faster or slower than the natural rate of the item. Negative values let you play the audio in reverse.