title: AVAudioPlayer.play() does not play sound
body: <p>Why doesn't the following code play a sound? It returns "true" for play(), but I cannot hear anything.</p>
  
  <pre><code>    let path = "/Users/account/Music/sound.mp3";
      let fileURL = NSURL(fileURLWithPath: path)
      var Player = AVAudioPlayer(contentsOfURL:fileURL, error:nil);
  
      Player.delegate = self;
      Player.prepareToPlay();
      Player.volume = 1.0;
      var res = Player.play();
      println(res);
  </code></pre>
  
  <p>If I use the following code instead, I can hear the sound.</p>
  
  <pre><code>    var inFileURL:CFURL = fileURL!;
      var mySound = UnsafeMutablePointer&lt;SystemSoundID&gt;.alloc(sizeof(SystemSoundID));
      AudioServicesCreateSystemSoundID(inFileURL, mySound);
      AudioServicesPlaySystemSound(mySound.memory)
  </code></pre>
  
  <ul>
  <li>OS X Yosemite 10.10.3</li>
  <li>Xcode 6.2</li>
  </ul>