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Happens when I'm near Lights with Dimmers (even on humbuckered guitars)
@ICBM explained why once - I'm not sure I could articulate it properly, so best wait for him to do it!
On mine, around 8 seems to be the worst.
I think it's something to do with Phasing of the noise, when you have volume up to 10, the amount of noise on the hot and ground is the same, and out of phase which then causes some noise to cancel out. When you turn the volume down, some noise from the hot is going to the ground, stopping the cancellation as the levels aren't balanced anymore.
I've probably got something wrong, but I don't think I'm that far off.
The actual cause of the noise is poor shielding - usually because the wiring from the jack to the pot is plain unshielded wires. Try replacing this with shielded cable. Shielding the control and jack cavities will also help, if it's not done already.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
You'll need to shield the cavities with conductive paint or copper tape (I find tape more effective, you can more easily solder a good ground contact to it and solder across all the joins to make a really good shield) and replace the cable to the jack for the best effect. I don't replace the rest of the wiring to the pickups, I find that changes the tone in a not-good way (controversial ).
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein