I've inserted a Hype document containing both visual animation and sound into a self-hosted Wordpress page. I proceeded as follows.
First, I tested the stand-alone Hype html in Safari, Chrome, Firefox and Safari iOS. All worked fine. Sound and vision.
Then I just copied the few lines of Hype HTML (the div) and inserted it into an html-capable widget in Wordpress. I edited the reference to the resources folder to correspond to where I'd uploaded it to the Wordpress site. Nothing else.
Lo and behold, it worked perfectly in all tested browsers, EXCEPT that there is no sound in any of them.
Out of curiosity, I used similar simple method to upload exactly the same Hype to an old Joomla installation. That worked fully in Safari (including sound), but no sound in Firefox and no image either in Chrome. That's interesting, but it's the Wordpress problem that I want to resolve.
Am I missing something simple?
Any help appreciated.