There is a new application note on split-grade printing on the Darkroom Automation web site. http://www.darkroomautomation.com/support/appnotesgmeasured.pdf The article stresses that the key point in getting split grade printing to work is the necessity of treating high contrast prints differently from low contrast prints. In this context high contrast prints are those made with a longer #5 exposure, and low contrast prints are those made with a longer #00 exposure. When split grade printing in the traditional 2-test strip method: High contrast prints must be made with the black-point/high contrast test strip made first. Low contrast prints must be made with the white-point/low contrast test strip made first. The article gives detailed information on split grade printing with a meter. It presents a simplified approach in which a simple graph gives you all the information you need to find the correct filter ratio. The complete contrast response of a VC paper - over all filtration settings - can be found with just three prints of a step wedge.