This is just something I kind of stumbled across that may well already be obvious to some people, but not to others, so I thought I'd mention it. The ways of doubling a pattern/design make for different outcomes, usually slightly from what I have seen, but they can be significant to the overall "look" of the output especially at higher pixel sized outputs. Way #1, select something to repeat say 4X with the filter controls (ie = just move the Repeat slider to 40. Way #2, set the Repeat slider to 2, then halve the Size, Pixels control (then you get 4 repeats also, but the details will look different than with method #1). I guess it has to do with FF being sample-based or whatever that is all about, I just thought it was interesting and wanted to share my find.
jffe
Filter Forger