QTR-Quadtone RIP

Hi all,

I am a newbie using QTR for a novel application.  I work in a research 
lab, and we're printing metals onto a piece of glass using MIS 
refillable cartridges.  What I'm hoping to do is designate each 
grayscale value (0 to 255) a combination of specified ink densities 
from three cartridges.  From what I've been able to gather, I think 
what I need is an ICC profile, but I may be wrong.  I'm not sure how to 
construct this, since it won't be a linear setup at all.  Any ideas?

Thanks,
Wolfe