Hee hee! Hokkaido Brit, that’s great. My voice & speech teacher in acting college told a story that yours reminded me of… hey, heck, this might work for you too, Trigonal Planar, so maybe it’s not OT.
My voice teacher was a disciple of Arthur Lessac, one of the Grand Old Masters of voice training. One of his schtiks is the “Y-buzz” (you can read about this in his most-used book, The Use and Training of the Human Voice.) This is an exercize in which you make a really nasalized “eeeeee” noise at a low pitch so as to maximize the vibration in the roof of your mouth and other parts of your face. As you get better at it, you learn to maximize the vibration on other tones too, and at higher pitches. A room full of Y-buzzers at the top of their range are freakin’ LOUD. (This training is very useful for actors who do outdoor theater.)
So my teacher, when she was a student herself in the late 60s, had a fellow student in Lessac training that just could not get the Y-buzz. This poor lady tried and tried but could not get any resonance to speak of. The trainers did their best with her and ended up concluding that she should keep trying, but it might be a lost cause.
The student kept at it as much as she could, to the extent of trying to practice even when walking around New York City. One day, in Central Park, she realized that she might be sort of getting it – finally. She stopped and started to make some noise. She was getting some resonance all through her head. This is great! she thought, and really put some effort into it.
Then she started choking. She coughed up great slabs and strings and chunks of multicolored semi-dried goo that had apparently been clogging all her resonant sinuses and coating the back of her throat for god knows how long. She coughed up apparently cupfuls of this muck, thinking she was dying, hoping no one with in the Park was thinking of robbing or molesting her. When she finally caught her breath and horked up a last few malingerers from the back of her throat, she discovered that she now had a beautiful, clear Y-buzz… and from then on had no trouble in voice class at all.
I heard this, back in the day, and took it very much to heart, and started experimenting, since I had (and have) a ready supply of sinus goo. I can attest that you CAN clean your sinuses out with a good Y-buzz if you’re persistent. But I don’t recommend doing it in Central Park.