Need assistance in using negative edge (button release specials) in Street Fighter 4

Well, as of now I’m playing Dudley, Guile, Adon, and T-Hawk, and I was wondering if anyone could point me to a guide to show me a practical way to use the negative edge in a proper manner in street fighter four, or at least relevant to the characters I had mentioned in question.

I couldn’t find a large amount of info, just some stuff on event hubs and a guide on youtube when it came to street fighter 3, so if anyone can offer anything more in-depth, I would sincerely appreciate it.

Thank you!

I don’t think negative edge is that practical or necessary in SF4 for most characters. Maybe Guile it might be useful for, but I heavily doubt it’s required for any of the aforementioned characters.