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Loud Pink Noise interference/ground problem.

How can I get rid of that loud ass annoying high-pitched pink noise like hiss I get on stage from the lights? When I move over a foot or turn a certain way, it goes away but then when I move it comes back. Does not matter whether my bass is turned down or not or what venue I'm in its there most of the time. Changed all my gear, got a new bass and still get that from time to time. Ground switch does not do anything. Will a voltage regulator help? If not, what will?
 
I'm probably the last person that might be able to help you here, but...

My wife bought a Taylor guitar a while back, and I was trolling their website and found they have several videos on proper grounding, feedback, etc. Maybe something there might give you some insight?
 
How can I get rid of that loud ass annoying high-pitched pink noise like hiss I get on stage from the lights? When I move over a foot or turn a certain way, it goes away but then when I move it comes back. Does not matter whether my bass is turned down or not or what venue I'm in its there most of the time. Changed all my gear, got a new bass and still get that from time to time. Ground switch does not do anything. Will a voltage regulator help? If not, what will?
Is it hiss or 60Hz hum? If it's 60Hz RF and since it changes when you move around, then a "voltage regulator" (I assume you mean a power conditioner) won't help. If you are running single coil pickups, like on a Jazz bass, then setting both pickups the same volume might help (many basses with two single coil pickups have one of them RWRP - reverse wound reverse polarity - and hence get a humbucking effect when both pickups are set at the same volume). Putting a shielding kit in might help, too.
 
Make sure you are not plugging into the same A/C circuit as your lights. All PA and stage gear away from all lighting. You are getting a serious EMI blast when you are putting yourself in the "sweet spot". I have to think you have some lighting that is sharing circuits with your stage gear and or PA.

Lighting should always get plugged into a power circuit that is on a separate electrical phase from audio and video. This I realize is not always possible. Are you running wireless and was this part of your gear change?

Newer LED lighting doesn't seem to cause the same grief that incandescent's would with higher voltages surrounding you in a small stage area. Then again, is this only in one venue or in every club you play in? It could also be due to high EMI energy coming from an old refer unit in the basement below your stage.
 
Make sure you are not plugging into the same A/C circuit as your lights. All PA and stage gear away from all lighting. You are getting a serious EMI blast when you are putting yourself in the "sweet spot". I have to think you have some lighting that is sharing circuits with your stage gear and or PA.

Lighting should always get plugged into a power circuit that is on a separate electrical phase from audio and video. This I realize is not always possible. Are you running wireless and was this part of your gear change?

Newer LED lighting doesn't seem to cause the same grief that incandescent's would with higher voltages surrounding you in a small stage area. Then again, is this only in one venue or in every club you play in? It could also be due to high EMI energy coming from an old refer unit in the basement below your stage.

I believe that he mentioned that the noise comes and goes as he moves around on stage. If that's the case it probably doesn't have anything to do with what circuit he is plugged into.