Quote:
Originally Posted by soparch
... I have sorted it in ibooks with their -ibooks-media-overlay-enabled overlays but I cannot seem to manage it for other epub readers. ...
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Ah, there's the rub...
As an addenda to Hitch's excellent response, it should be noted that iBooks is not a true ePub reader. While it can read standard ePub books, it is primarily built around Apple's proprietary extension to the ePub spec.
It's not a matter of making things work is "other ePub readers", but instead it is a matter of emulating iBooks' proprietary functions in
standard ePub books, something that is not always possible.