RGB combo effects?

so I'm having a bit of trouble creating color effects that aren't static red, green, or blue on the RH4. Say I want a purple, pink, teal, etc, fading effect. I can make the effect happen with just red, green, or blue, but when I start trying to combine the colors and save to an effect pallete, the colors step through each other and don't really combine to the one color for the full effect.

Am I missing something in the effects engine?