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I read somewhere recently that crybaby wahs are prone to cause the kind of squeal you describe and the fact your guitar sounds fine with no pedals makes me think that could be the culprit, but you say that when you took it off the board, while it helped it didn't completely eradicate the problem. An obvious question but is there a pedal that, before you add it, everything sounds fine?
Saying that, even if there is, the problem may not be with that actual pedal, which may just be amplifying a problem further on down the chain all the way to your guitar. You mention modifying your guitar. did you change pickups for really hot humbuckers or something. I've heard that these can cause similar problems to the ones you describe. It's not necessarily a problem with the pickup, you may just need to put in some kind of capacitor.
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