: Re: Is it advisable to add sound excerpts to an ebook? As far as I know, many ebook readers may also play music. Does it make sense to create an ebook which contains (internal) link to audio

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The EPUB 3 standard clearly specifies audio capability:

EPUB 3 supports audio and video embedded in [content documents] via the new [HTML5] audio and video elements, inheriting all the functionality and features these elements provide. (For information on supported audio formats, please refer to Core Media Types [Publications30]. For recommendations on embedding video, refer to Reading System Conformance [Publications30].)

One particular feature is to synchronise audio with text, so you might not need links:

Another key new multimedia feature in EPUB 3 is the inclusion of Media Overlay Documents [MediaOverlays30]. When pre-recorded narration is available for a Publication, Media Overlays provide the ability to synchronize that audio with the text of a Content Document (see also Aural Renditions and Media Overlays).

Since there are readers without audio (or even EPUB 3) support, adding audio is a design decision. Do you use sound only for flair or is the book barely enjoyable without it? Does it make sense to offer an alternate version?

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