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From owning years of Sentras with chain, I can tell you there's a distinct whine, but there should be no clatter, not unless the tensioners wear out (and they do).
But put beside the whine of the AC compressor, alternator, the accessory belts in general and the general underhood clatter, it's not really something that matters. At least, the only manufacturer I ever heard to claim a switch to belts was for noise was Nissan, with their Navara diesel (which ain't a quiet engine, anyway, not by far).
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