so i just got an '80 stingray. and it sounds great! but now that im at home and have more time with it to eperiment, i've found that there's quite a big jump to an extremely bright sound when i roll the treble up. it happens at about 3/4 of a turn from 0/rolled off. it sounds steady when you're turning the knob up then suddenly it just gets extremely bright. would you guys have any idea what's causing this? it's a nice sound for slapping but i'd like to have a smoother transition from normal tone to slapping tone. any help would be much appreaciated. ps: now that im here, id also like to ask, how do you fix scratchy pots?