Mickey: High pitched noise coming out of the speakers when moving the mouse

This is some seriously weird shit I noticed this several days ago. Barely noticeable high pitched noise coming from the speakers when I move the mouse. I heard about this in past, it's supposedly something to do with electrical interference or something.
I believe everything is properly grounded (why/how shouldn't it?), and I have standalone soundcard connected to an amplifier.

When I turn the amp volume all the way to the max, I get permanent cracking noise plus the buzzing when I move the...

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