the smart string nodes
and the plastic rectangles, and metal squares
I've noticed with the plastic rectangles, and metal squares.
channel 1 lights up all three led's with a color (one of the R,G, or B,)
channel 2 lights up all three led's with another color (one of the R,G, or B,),
channel 3 lights up all three led's with the remaining color,
it seems as though a single plastic rectangle would be three channels. (each led is not individually addressed, unless this is somehow controlled by a smart string controller)
it seems as though a single metal square would be three channels. (each led is not individually addressed, unless this is somehow controlled by a smart string controller)
so if you chose red for the first node, then all three led's light up as red, etc. etc. for the other colors.