function handle() {
    /*
      Help from: http://jsbin.com/badimipi/1/edit?html,js,output
    */
    if (_config2.default.audio.buffered.length - 1 >= 0) {
      var bufferedEnd = _config2.default.audio.buffered.end(_config2.default.audio.buffered.length - 1);
      var duration = _config2.default.audio.duration;

      /*
        Set the computed song buffered value to the config.
      */
      _config2.default.buffered = bufferedEnd / duration * 100;
    }

    /*
      Sync the buffered progress bars.
    */
    _bufferedProgressElements2.default.sync();
  }
As the song is buffered, we can display the buffered percentage in
a progress bar.

HANDLER FOR: progress

@access public