I'm looking for a good way to generate periodic white noise.  I tried Gen21, but makes the signal for standard noise unipolar. I tried using some of the other noise types, and got some results, but it was not quite what I was looking for.  I tried other noise types, like Guasian, but could not get the desired results (maybe I'm doing this wrong).

 

A program that analyzes wavefiles into harmonic or enharmonic components might be the best useful to me.  I could then use Cool edit to generate noise, find the segment I want and break down the partials, and translate them into Csound.  I used to have a program that broke the waveform down, but don't know where to download anything like this. I guess I could load samples. 

 

Any thoughts?  Thanks.