I keep asking the same thing... Then I'm still lost haha
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oh not the humming blues again Shazzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz !!!!
Sometimes you can get what's called a "sympathetic vibration" with springs on some guitars where the springs will start vibrating when you play a certain note on a certain string acoustically, happens in Fender Stratocasters.
See if you can pinpoint where the high-pitched hum is coming from, that will most likely give you an idea on what's causing it, does the high-pitched hum sound like it's coming from the headstock end of the neck?, or does it sound like it's coming from the body of the guitar?
If it involves the strings, the high-pitched hum could be what I call Sitar-Buzz, which is sometimes caused by the string-slots in the nut, what happens is that the string vibrates against the side of the nut and makes a Sitar-like buzzing sound, a sure sign is that the string doesn't sustain for very long.