QTR-Quadtone RIP

I'd like to use Curve Creator in QTR to create a curve where each dot 
on the paper would be made of matte black ink and a slight amount 
(maybe 20-25%) of yellow. I'll be printing at 1440 dpi, and I want the 
image to print as a series of distinct dots, not a continuous tone 
image. I'll be using this to create a transparency for burning ethcing 
plates. 

Can someone give me the curve creation settings for the inks (density 
and limit) and for the overall Default Ink Limit and Black Boost

Best, David