I'm thinking of audio or video enhancements to nonfiction as being pretty much in the same category as other supporting material that we have now, whether it's illustrations and photos, descriptive footnotes, appendices, etc.--material that is not strictly necessary, but useful to refer to if the reader so desires.
If an appendix now might include the full text of a speech, why wouldn't it be a good idea to also have an audio clip of that speech as it was delivered at the time (not some actor offering a rendition--the real deal if it was recorded).
If one is reading a book on film, wouldn't it be useful to be able to see a clip of a scene being analyzed, rather than just a handful of stills of the scene, as might be included now?
I think there's a lot of potential for enhancements being gimmicky and stupid, but they could also be very useful if included in the right way.
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