Steve, I do that ALL the time, I program each element one at a time like Lynx Expresses, programmable snow tubes, matrix, mega tree, Pixel mega tree etc and then add each segment to the master sequence when I am happy with it. I mostly do it because LSP doesn't let you test one element at a time, it looks to output to all elements and comports. I would LOVE to be able to disable output to certain controllers so that I can test one element on its own. Once a pattern is used, it is on its own in the sequence and is saved/stored in the pattern file until you use it again. So no it does not create any impact. Back to backing everything up so I can test Nutcracker today.