I'm encouraged on the one hand by the OP, Pittendrigh, but discouraged by the lack of enthusiasm, even disdain shown by some of the other correspondents.
I thought that, by now, embedding would be a mainstream activity (or even streaming, for larger files) but I'm finding it difficult to locate specific documentation. KDP's guidelines left me confused after a first read. They say that embedded audio and video is not possible for Kindle books but elsewhere they say it is possible for Kindle Editions. I haven't yet understood the difference. Clearly, time and further efforts are required because as Deskisamess says in a post above, there are already some ebooks with audio so there IS a way.
Amazon guidelines do specify how to incorporate code to embed audio and video and how to leave a message for those reading devices which can't cope. This reminded me of the gymnastics required around 2015 to get images to display nicely in older DX kindles - those devices have possibly all retired by now?
I was hoping to add some short audio clips (some 10 - 15 secs) of musical progressions into a non-fiction book. I can just as easily produce a short video clip showing the notes corresponding to each sound. The files concerned are very small so embedding will not be a problem.
I've tried the first audio clips in Sigil which plays them back well but Calibre can't. My older Kindle Fire 6 can't play the audio either. Ironically though, it can read aloud through the passage where the file is and even announce that the audio clip is there.
The epub version displays well in my smartphone and the audio plays but as others have noted, the smartphone format is not ideal for a reading session.
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