This is probably something that you have looked at already, but here is a link to a dictionary search for all words that start with polyph and have 4 letters after. The most related one I can see is polyphonic. Maybe that has something to do with the audio?
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That's #2 on the suspect list actually.
Our top three candidates are, in order,
I really like the way you think; you're pretty resourceful. That website you linked seems ESPECIALLY useful. I would've loved to have had that during some earlier puzzles.