"Richard Clark" wrote in message

On Mon, 19 Feb 2007 15:16:29 -0600, "Henry Kolesnik"
wrote:

There's a good example of a 3D plot he
http://www.spectraplus.com/screenshots.html#3d
Has anyone used this software?

Hi Hank,

Yes, I have. It is exceedingly expensive, but you can
probably get 30 days of free use if you have a one-time
knock off project. Of course, it may take 30 days to
figure it out.

FFT analyzers are a dime a dozen, but few know how to use
them accurately - or are even aware of what can be done
with them. Bob's complaint, notwithstanding, a 1024 bin
FFT employing the proper mixing inputs can resolve any
note on a guitar to within hundredths of a cycle. I am
sure this is of no interest to you, however.

Over the years, the most useful FFT software I've had, is the (fairly
simple) FFT analyzer in Audition/CEP. It's big plus is the ability to use
the Audition/CEP audio editor to select portions of real-world waveforms,
and to use the wave generation and modification features to create waves for
use in analysis and testing.