Thanks Cawwie,
Aloha JohnA,
One starts focusing on the upper dantian (or third eye) in Level III. That's generally where one will start developing those senses. In Chunyi's classes Level I build the lower dantian energy, Level II the middle, and III & IV, the upper. A solid structure needs good support. The same goes energetically.
You can start the healing work of Level II on others right away as you're doing the Level I exercises for your own healing and developement. Chunyi recomends working into the Level II active exercises after you've made a shift physically from doing the Level I exercises.
I'm not sure about what your refering to with the "HHHHmmmmmm." Perhaps Cawwie has addressed it.
Much Love, Shawn