So I downloaded SPAN so I can see how my songs sound, because I sure can't hear them very well.
Watching the thing work, I start wondering where those 14k-20k noises are coming from, a little curiosity.
I mute all the tracks and unmute them one at a time until I find the track making all the squealing.
It's me!? How am I making such high-pitched noises? Sibilance? Harmonics? Sympathetic vibrations from my fillings? The sloshing of my spittle? I swallowed a parakeet?
Since I can't hear it, it doesn't bother me, but I'd like to apologize to all the hearing-abled folks who can hear it and wondered what the heck it was.