mathematical software for musical calculation

As pointed out by Ed Borasky, Derive is quite a bargain. Also, the new student version of
Matlab is uncrippled for the first time (used to limit the max matrix size) and at $100 for
students it is quite a bargain. It can make wav files too, so you can hear your experiments.

--
John Starrett
"We have nothing to fear but the scary stuff."
http://www-math.cudenver.edu/~jstarret/microtone.html