With LED fixtures, this means you are chasing the BLEU and GREEN up and down while the RED stays at full.
Both GREEN and BLUE are set with the exact same values, for this you can use the FX LINK function, search for it on the controllersupport.martin.com
A square Sin is used and a Step By 6 FX Timing
If the fixture as a white channel too, add white to the FX but invert the Square wave
In the example I used 16 fixtures