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There is software that combines the two. Trying to coordinate two completely unrelated files, from different sources, is virtually impossible. What I mean is, there is nothing in the .mp3 (or whatever) file to mark words so that the same words could be found in the (also unmarked) ebook file.
If the files were encoded to work with each other, or clips of both were displayed together (as the software does), that's a different thing, and perfectly possible.
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