Fading to a new color using a chase?

Does anyone have a better way to do the following?

Along our back curtain we have 18 RGB LED wall washers. I'd like to create an effect that makes the color change start at one end and then fade (chase ) across until all the lights have changed to the new color. I have created a set of different groups selecting the 18 RGBs in different orders ( right to left, left to right, center to outside and outside to center) but I haven't found a way to do use these to do the chases.

I have suceeded using the programmer and giving each fixture a different delay time but it seems like there has to be an easier way.

Thanks!
Joe
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