can't control colour changers on 4 sub masters ION

HI everybody

I'need to control some colourchangers CMY (Fly tricorma) using 4 sub masters: 1ch dimmer, 2ch magenta, 3ch ciano, 4ch yellow.

The question is: how can sum the colors?? when I try to have the red for example (magenta + yellow) first I lift the magenta sub and when  I lift the yellow sub the magenta go down.... I need that the magenta remain up...

Please help me ....

Thank you

Leonardo

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