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Thinking of dialup networking, I guess somewhere around 56 kilobits per second is certainly feasible? hehe :)

Probably more. The phone network had a bandwidth of 300-3300 Hz I think. Audible spectrum is larger

True, but roundtripping speaker -> microphone is lossier than a cable carrying electrical signals.

I was thinking the same. Minimodem[1] turns devices into FSK communication devices. Analogous to transferring information via dial-up.

I was originally thinking the post was more like what you shared.

In theory minimodem could be put into web assembly right?