There were some good tutorials concern expression c. Y2K back for Posette and Victoria 1 which had a more limited number of dial. Maybe doing studies with a figure like Posette would be enlightening. Posette Expression magic was a very good product. Posette looks really good with a good texture and Stahlratte's morphs to fix the eye, lip and nose edges. I am sorry I can not find the tutorial URLs for you right now in case they are still up but an old "Flying Dutchman" site that has not been updated might have tutorials links... I still have old ghost sites from 1997-98 up on free hosts because I can't remeber the passwords to take them down!