Hi Roy,
This worked perfectly. I have only made experimental .qidf (text) and .quad on Mac for a quick grasp of methods, then saved .quad file in P900 folder on Win machine. Printing through Win GUI Quad900 printer showed the curve, and printed with my expected hue (exaggerated for experiement). Top pictur is unmodified (no V) and bottom is modefies (+V). Now for the hard part of creating actual curves, and setting up split-tone curves ... thank you for your help.
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