Background Music Demo

Thanks to Jackson and as well all others for sharing this wonderful post :)

I needed to play an intro song at the first few slides which later stops at a certain slide. So I removed the loop in the HTML5 <audio> tag.

<audio src="song.mp3" id="bgSong" preload="auto" autoplay></audio>

And, as I dont liked the abrupt ending of the song, I made a smooth fade-out with a javascript trigger:

var sound = document.getElementById('bgSong');

var fadeAudio = setInterval(function () {

 // Only fade if not at zero already
 if (sound.volume != 0.0) {
 sound.volume -= 0.1;
 }
 // When volume at zero stop all the intervalling
 if (sound.volume === 0.0) {
 clearInterval(fadeAudio);
 }
 }, 400);

This works fine for me, but - to be honest - there is one thing, that bothers me. The Volume slider in the Storyline player has no influence to the <audio> song.

My question: Is there a way to forward the current level of the volume slider into other javascript variables?

I am grateful for any advice!

Regards,
Dietmar