rate
The current rate of playback.
Declaration
var rate: Float { get set }Discussion
The playback rate refers to the playback speed. A value of 0.0 indicates that playback is paused while a value of 1.0 indicates playback is proceeding at the natural rate of the item. Rates other than 0.0 and 1.0 let you play the audio faster or slower than the natural rate of the item. Negative values let you play the audio in reverse.