On Mon, 19 Jan 2004 08:05:13 +0000 (UTC),
(Stewart Pinkerton) wrote:

Try 400 and 401 Hz then - far more obvious.

Um, you think that he can hear a 1Hz tone more easily than a 50Hz
tone? From which planet are you connected to the Internet?

You can, and will, hear a 1Hz beat. Piano tuners do it every day.