When I turn my volume pot down it goes completely, but when it's turned on full I get a really irritating hum in both pickup positions, but it is noticeably reduced when both pups are selected.

It's really annoying.

Could it be that my leads are a bit shit? I've had them a couple years and they're not particularly great leads, just ones i've collected from gigs and such ahah.

Or could it be something else?
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Like said above...probably bad ground. Check for wires that may have come loose as well.
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You mean inside my guitar? The buzz seemed reduced when I held the guitar differently.
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