Modem handshakes (also known as 'the dial-up sound') varied based on a lot of factors, to the point where no two were identical. Speed was a major determinant, yes, and older modems did not include that sound that you're talking about.
I have no doubt that there are folks out there who can determine the speed of the modem based on the handshake alone, although I am not one of those folks.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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