In the slowed down version it sounds more unvoiced (it sounds like "you sing"). In the original, I would say it's that halfway sound which I associate with many non-native speakers of English. It's somehow a rather sibilant voiced "s". It reminds me of the way that the girls in ABBA used to say the "s" at the ends of plurals and third person singular verbs in their songs. Because they weren't native speakers, the "s" never sounded properly voiced and was a just a little too sibilant but it wasn't completely unvoiced.
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