I also experience this high pitched ring inside my head. In fact I usually hear/sense? is throughout the day on several occasions and every night I lay down for bed. Whether I be to sleep, lucid dream or attempt some type of projection.
I'm not quite sure what this ring is actually, it is controllable as you know yourself. One night, try to concentrate on that ring, very slowly increase the pitch of the ring. Don't go to fast, when I mean slow, I mean really slow over a period of about 30 minutes.
See where that gets you, I've had some very unusual experiences playing around with the ring that way, a bit to unusual for words to describe.
Good luck and have some fun with it.
~Ven
I'm not quite sure what this ring is actually, it is controllable as you know yourself. One night, try to concentrate on that ring, very slowly increase the pitch of the ring. Don't go to fast, when I mean slow, I mean really slow over a period of about 30 minutes.
See where that gets you, I've had some very unusual experiences playing around with the ring that way, a bit to unusual for words to describe.
Good luck and have some fun with it.
~Ven