Shell finale timing ideas

Thought I'd put this out there - interested in learning more timing methods for shell finales. I'm self taught so do it one of two ways but am curious as to other ways to do it. (when I say shell finale, aren't they all? - what I mean is a rolling finale - bursts on top of bursts , increasing in intensity)

a) - I use several full racks on pyrotimers, with chains for left (20 degrees or so), up , and right. I'll add extra chains with shorter delays when I want the finale to build up. For...

Shell finale timing ideas