Am I the only one whose thoughts first turned to (young) children's books? It seems like a great idea, for example, to have cattle lowing in the background while the book (presumably being read by the parent) talks about cows.
It could also be useful for educational books too - engaging learners with aural as well as visual cues would probably help with understanding and retention. A book on music theory or music history with examples being played in the background could probably make use of this.
I don't know as I would ever personally encounter/use this technology, but it still seems like a good idea. Just because the enhancement is available, doesn't mean that it will see widespread use.
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