"I'm insane and you are my insanity"
I don't thing you know what insane is, but each to their own.
I've heard them before too; they sound electronic and man made. Only happened maybe twice. I just disregard it. Too much weird shit going on these days. When I start "seeing" weird beeps...then I'll have a little concern...
Hold on for one more day.
what if 7billion people heard a tone at once around the world....
skip to 00:05:30 on this aphex song. I've done the same thing using fruity loops.
You can put images or texts, whatever. Who knows what they're putting in techno music....