As modems got faster, the tones being played were pretty identifiable by a human. I could tell if my 56k connection was negotiating down to 28.8 or some other s

As modems got faster, the tones being played were pretty identifiable by a human. I could tell if my 56k connection was negotiating down to 28.8 or some other slower speed and preemptively disconnect and try again in order to get a better connection.