Interesting. No, the sound seems to come from the sinuses.
Hi Morgan,
Okay, yes, I have gotten a single sinus click (other times the nasal passages just seem to open more) and when it has happened I've noticed that it seems to come with the brain starting to focus ("access"), the brain getting the relaxation that comes from letting go of the buckshot rapid spray other thoughts and feelings, brain just let's them sail past. Versus a sound, for me, it is a palpable click (or just an expansion in the nasal passages). This click/expansion may actually be an early sign (nimita) of a phase in concentration for those of us with tighty noses but not so common as to put it in nimita write-ups