@ThunderStone If you want a rainbow I would use the Expandable Color Ramp.  One of the options is to blend between 2 colors of the color wheel.

In the example above it just has 2 colors and does a HSV Far blend style.  What that means is that starts at a Blue color and works it's way around the color wheel towards Green. But in order to get there it has to pass through Red.  In Poser Red is Zero, Green is 120 and Blue is 240 if you were to use the HSV node to make colors. Below is the expandable color ramp with 6 colors Red 0, Yellow 60, Green 120, Cyan 180, Blue 240 and Magenta 300.  you can see those colors on the 2 edges. The bands in between are those colors and how the different blend styles effect the color shift.  I like the second (third if you count the edge colors) band in.  This is a simple gradient with the ease applied.  What that means is that the colors that define the start stop have a greater effectiveness and show for a longer time instead of being a straight gradient.

you can find more information about the blends in the PDF I included with the Expandable color ramps. The nice thing is that you can choose how many colors to make your ramp instead of being stuck with the 7 I had in the orignal version.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13