Effect high and low value

Hi everyone,

Is it possible to have an Effect with a hi and low value?

I know that it's possible to say: group 1 effect @ color 1 thru 2. But the result will be that he won't use the preset colors but take over the values in %.

Where I'm searching for is that you can say; effect high color 1 (red), effect low color 2 (blue). The effect will fade from red to blue in this case.
han if I change color preset 1 to purple the effect would be like this: effect high color 1 (purple), effect low color (blue). The effect will fade from purple to blue because I've change the preset.

Thanks :)