4 points by damiaozi 2 days ago | 3 comments
https://www.youtube.com/watch?v=NegOHzcBlHQ (1:09)
btw, In the real world, in addition to the early Ma Bell telephone system(in-band signaling), are there any complex systems that are controlled by tones (not human voice)?
toast0 1 day ago
pmdulaney 2 days ago
readyplayernull 1 hour ago