That picture cleared up perfectly what I wasn't understanding. Thank you. Unfortunately, I don't think that will quite work for what I want to do. I'm hoping to find pixels that are RGBW, and be able to put them in series like regular RGB pixels. I don't want to have a bunch of the DMX decoder boxes floating all over the display to get the strands to work... I'm thinking I might need to ask over at the Falcon forums and see how to utilize 4 channel modes - I see some 4 channel pixels listed on the support pixel types page, but don't see them in my list to select from, so I'm thinking this is very much turning into more of a Falcon question than an xLights question.
I really appreciate the insight you've put here, though!