code: function(index) {
      var self = this;
      var sound;
  
      index = typeof index === 'number' ? index : self.index;
      var data = self.stations[index];
  
      // If we already loaded this track, use the current one.
      // Otherwise, setup and load a new Howl.
      if (data.howl) {
        sound = data.howl;
      } else {
        sound = data.howl = new Howl({
          src: data.src,
          html5: true, // A live stream can only be played through HTML5 Audio.
          format: ['mp3', 'aac']
        });
      }
  
      // Begin playing the sound.
      sound.play();
  
      // Toggle the display.
      self.toggleStationDisplay(index, true);
  
      // Keep track of the index we are currently playing.
      self.index = index;
    }
docs: Play a station with a specific index.
  @param  {Number} index Index in the array of stations.