Well I may be able help just a little bit.
1. The toogle switch on the lamp housing is for turning on/off the light for the dichro filter settings. It just allows you to see the settings in the dark with a light backlighting the dichro settings. When printing colour I learned to turn it off after a few mysterious brown streaks
2. This I have no clue. Maybe some with more wisdom can answer this.
3. The high and low settings are for the output intensity from the head. The white setting pops the dichro filters out of the way of the light path to allow just light from the lamp to flow.
4. Manual, Hmm, I never got one with mine either.
Hope this helps. Its a nice fast head. At times too fast