No tuning is necessary for the actual drum head. As stongej2002 said, tighten and loosen for feel. You may need to "tune" the drums in the module based on the type of music you play for custom kits and/or if you have more than the standard amount of triggers.
Easy to do using the manual and editing the triggers though. If you're looking for information on the scale you should tune to, I would say to look up circle of fifths or fourths - say, if you had more than 4 toms...