tl;dr: Create two 3-point curves with the specified points. Mix onto channel 5 switches C and D using those curves.
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CH05 (+100%)SC Curve(Curve 1)
(+100%)SD Curve(Curve 2)
Curve 1, type: 3 points (17,50,83)
Curve 2, type: 3 points (-100,0,0)