Sounds like Star Wars droids, but a bit more annoying. Designing a system of sounds that would be robust to noise and distortion, high bandwidth, and pleasant-sounding for humans would be a really interesting challenge.
A very interesting idea. How many tones are there? How many beeps need to be made for 1KB of data?
Straight up genius!!! Would love to see it built in at OS level as it has all sorts of uses.