Building custom color effects

Using a ColorSource 40AV how does one create an effect using a color scheme that is different than the ones included in the console?

Specifically I would like to create an effect between two specific colors using intensity and parameters that are built in to the board.  

If it helps, the instrument that I am using for the effect is an Element Hex.

The built in color schemes do not appear to be editable (would be nice if they were).

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