Thanks! I've played with that before.

I have multiple tones simultanously and constantly in both ears that range between 6,000 to about 12,000 Hz. I can identify 3 or 4, and they're there all the time. Only the volume seems to change.

I started out with a single tone many years ago, but more tones got added over time, and its become layered if that makes sense.

I don't know if that's how others experience it or not, but that's what its like for me.