Method for embedding sound files into your RP document

Hey mbc66!
That helped a ton.
Maybe you know how to overcome my next hurdle, too!?
For the example above, a base64 coded audio ist used, to have it locally.
This works fine with one sound effect. I’d like to find a way to control multiple sounds, ideally playing simultaneously.
You yourself made a sample file here, but with the files stored online. I need the sources to be kept off-line. Is there any chance to combine the best of these two methods?
I hope it’s just a litte line, that a know-nothing like me just could not come up with.

Again, thank you. I appreciate you taking your time for me.
Greetings from Germany,
Ben