Hi Steve and Koz,
Sorry that I took so long to respond, had to find the link to that post.
What I do to learn Nyquist, I collect whatever plugins people have written and then go through them, try them out and edit them to better understand.
I normally also keep the url, but in this case, must have forgotten.
Anyways, here it is:
The direct link to the plugin:
http://forum.audacityteam.org/download/file.php?id=8679
Steve, thanks for the suggested change, will try it out.