3d spectrogram: [link] Animation of the picture illustrated in this article: [this video] If you live with someone >= 30, turn up the volume and wait for him/her to appear at the door for a nostalgia moment...
I like this explanatory graphic (after many many years of listening to the dialup sounds) - [link] And this version combining the graphic and the sound used to make the graphic: [this video] And this alternative version (h/t @Kye): [link]
Combines the explanatory graphic with the modem sound.
The dial tone was prior to dialing. Upon connection, there was an audible sound from the modem handshake. Through some google searches, I came across this recording: [this video]
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