[time-nuts] Sound Card Spectrum Analyzer

[Martin Richmond-Hardy]

Bob,
For a Mac (non-evil OS?)  there's iSpectrum http://www.dogparksoftware.com/iSpectrum.html
It's free but unsupported.
Probably doesn't tick all your boxes though. Dogparksoftware also make  
MultiMode (not free) which has some FFT facilities.
Also free: Sonogram The Software should run on MS Windows (98, 2000,  
XP and Vista), PC-Linux, Sun Solaris, and Mac OS X.
http://www.christoph-lauer.de/Homepage/Sonogram.html and http://sourceforge.net/projects/sonogram/

Martin