Here is what I have worked out regarding the use of expressions in fixture definitions. Can't work out what COMP represents. Component types: R: red (R) G: green (G) L: luminance ((0.299 * R) + (0.587 * G) + (0.114 * B)) W: white (min(R, min(G, B))) B: blue (B) C: cyan (1 - R) M: magenta (1 - G) Y: ...