I've simply used the settings recommended by Ilford for the dichroic head that I've got. Seems to work fine. Should I be doing my own calibrating?
Gavin, once you get up and running with a dichroic head, make sure to pull out a contrasty, difficult-to-print negative and have a go at split filtering. I just went dichroic recently, and split filtering has been the big revelation. I made some prints of pure white dogwood blossoms. I got detail in the highlights, right next to almost-black shadow areas, with no dodging or burning. Amazing!