The crackle could be caused by the pot getting a little too hot when soldering or dust/crud getting in it. Just work the knob a bit and see if it clears or give it a blast of air in through the gaps in its casing. If that doesn't work you can get a can of electrical contact cleaner and give it a squirt of that... but, if it's cooked it may just be cheaper to replace it eventually.
Edit: too late, DB and PK already have you covered.
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