QTR-Quadtone RIP

howdy-

firstly, i just started using QTR and am extremely impressed. truly
awesome.

Mac OS 10.4, MediaStreet GQ inks, & R200; do i create create a
platinum curve just by using the light magenta, cyan, & black? is it
really that easy? i've had great luck making my own neutral, warm, &
cool curves but my platinum just looks funky.

i ask because i'm not able to figure what's going on in the supplied
platinum curve descriptor file ("Photo-platinum" in the "R200-R300-GQ"
folder). C & LC curves are being copied to M & LM respectively. but
where did the inklimits being used come from? is this still based on
density or L*, or are these numbers kind of arbitrary?

thanks,
daniel