     The audio player’s playback rate.
     This property’s default value of 1.0 provides normal playback rate. The available range is from 0.5 for half-speed playback through 2.0 for double-speed playback.
     To set an audio player’s playback rate, you must first enable rate adjustment as described in the enableRate property description.
+        
+        let ap = C4AudioPlayer("audioTrackFileName")
+        ap.enableRate = true
+        ap.rate = 0.5
+        ap.play()
+
     */
     public var rate: Double {
         get {

    
    /**
    Initializes a new audio player from a given set of file names. The files will be played in sequence.
    */
    convenience public init(filenames: [String]) {
        self.init()

    
    /**
    Initializes a new audio player from a given file name
    
        let ap = C4AudioPlayer("audioTrackFileName")
    */
    convenience public init(_ filename: String) {
        self.init(filenames: [filename])
