Phase, and Beat demonstration

[David Boyce]

Searching for a nice continuous 440Hz tone to calibrate Tunelab I found this 
site http://www.indiana.edu/~emusic/acoustics/phase.htm

It has a nice demonstration of beats, at the bottom of the page, with 440Hz, 
441Hz and 442Hz you can switch on and off together. Might be nice to show 
customers if they are very interested.  Sometimes I demonstrate with a 
C523.3 and a C517.3 together. Plus with piano strings, of course.

Best,

David.