code: function play(name) {
          if (name === 'list') {
              return Object.keys(audio);
          }
          if (!(name in audio)) {
              d.error("Invalid audio name:", name);
              return;
          }
  
          audio[name].play();
      }
docs: @ngdoc method
  @name play
  @methodOf coa.audio.service:player
  @param {String} name The name of the sound to play.
  @description
  
  Play the sound. If name is 'list', then the list of sound names is returned instead.