Your little tidbits leave me with more questions and concerns.

Are you building a product intended for multiple versions of Poser? The numbers in the UserDefined node prior to Poser 7 SR3 were bugged. Poser erroneously used the square root of the values you put in there. Most people cannot make a shader that behaves the same in all Poser versions using the UD node. I can, but I know all the math and can navigate the material room blindfolded.

Also, what exactly were you trying to do with the HSV node? I can use it to produce any color in HSV mode quite easily. Set the color chip to YELLOW. This is numerically hue number 1. Then the hue scale parameter works correctly because it is scaled by 1. Saturation and value work as expected. Its the hue that is tricky.

The hues are:

Red=0

Yellow=1

Green = 2

Cyan = 3

Blue = 4

Magenta = 5

Hue is modulo 6, so when you get to 6 you're back to red.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)