public function apply($transformer, $audible, $node)
 {
     $audio = Audio::create();
     // Builds the image
     $url = $this->getProperty(self::PROPERTY_AUDIO_URL, $node);
     $title = $this->getProperty(self::PROPERTY_AUDIO_TITLE, $node);
     $autoplay = $this->getProperty(self::PROPERTY_AUDIO_AUTOPLAY, $node);
     $muted = $this->getProperty(self::PROPERTY_AUDIO_MUTED, $node);
     if ($url) {
         $audio->withURL($url);
         $audible->withAudio($audio);
     } else {
         // URL is a required field for Audio
         $transformer->addWarning(new InvalidSelector(self::PROPERTY_AUDIO_URL, $audible, $node, $this));
     }
     if ($title) {
         $audio->withTitle($title);
     }
     if ($autoplay === "" || $autoplay === "true" || $autoplay === "autoplay") {
         $audio->enableAutoplay();
     }
     if ($muted === "" || $muted === "true" || $muted === "muted") {
         $audio->enableMuted();
     }
     return $audible;
 }