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Dial Up Modem Handshake Sound - Spectrogram - YouTube
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Dial-up internet was defined by a distinct sound — Quartz
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What is a suitable emulator of dial-up modem sounds? - Quora
This is what a dial up modem connection looks like on the spectrogram (DTMF handshake and call). : r/interestingasfuck
How A Dial-up Modem Handshake Works | Hackaday
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The Bleeoo Project demands your best dial-up modem impression - CNET