Thanks for the input. I have (like a lot of us here) always been fascinated by the SO. And I agree with the comments on that other thread -- I believe they have a
sound of their own too.
I have to admit -- the first time I heard you start yours, I was standing too close to the sidepipe. Scared me pretty good. Don't know if you remember the look on my face -- I tried to hide it.
(We were at Gordon's, at the inaugural Arizona Cobras get together...)