Sound recorder: “World’s ultimate in noise modulation” (6)

Guardian Cryptic #29487 | 24 Across | 2024-09-13
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I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

definition: Thomas Edison the inventor – see [wiki] last/ultimate letter of [Worl]-D, inside anagram/”modulation” of (noise)*

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