LED Effects on ION

Probably staring me right in the face but how can I make an effect with led's that runs ONLY the one color per step.
Say I want a Red Green effect cause it is Christmas. I created it as Absolute and picked my two Color Palettes; red for one step and green for the other but when it runs it goes through yellows also because it is running through the picker that way. Shouldn't led's be able to switch without having to blend?

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