code: function (processSound) {
      var found;
      var i;
      var sound;
  
      if (!this.loaded) {
        warn('Sound not loaded yet. It will be played once it finished loading');
        this.mustPlay = true;
        return;
      }
  
      found = false;
      this.isPlaying = true;
      for (i = 0; i < this.pool.children.length; i++) {
        sound = this.pool.children[i];
        if (!sound.isPlaying && sound.buffer && !found) {
          if (processSound) { processSound(sound); }
          sound.play();
          sound.isPaused = false;
          found = true;
          continue;
        }
      }
  
      if (!found) {
        warn('All the sounds are playing. If you need to play more sounds simultaneously ' +
             'consider increasing the size of pool with the `poolSize` attribute.', this.el);
        return;
      }
  
      this.mustPlay = false;
    }
docs: Look for an unused sound in the pool and play it if found.