I still don't get this. I've been reading every article that comes along, each one trying to explain what's "really" happening, but it still doesn't make any sense to me.
I keep hearing in news shows, "You can hear both names because both are really there!" But I don't see how that can be true. The spokesperson for vocabulary.com says that the original recording is of a man saying, "laurel." The man didn't have the magic ability to say two words at once. He was a human being saying one word. A word, which, by the way, doesn't share any common consonants or vowels sounds with the other word being heard. Yet I hear nothing but laurel from the vocabulary.com site, and nothing but yanni from the other recordings circulating. Even weirder is that the two voices also sound nothing alike to me. One is high pitched and robotic, the other sounds like a regular man speaking.
So that leaves the recording itself. The story goes that a person made a recording of the recording..did that degrade the quality? Yet how can it add sounds that aren't there? I keep hoping somebody out there will give us a more satisfactory explanation!