Hi! I just bought a Casio PT-30, and I really love it, except that the volume slider doesn't work properly. At maximum volume, it is very loud, but if I set it even slightly lower, it's barely audible. The listing made no mention of this defect, so I'm a bit unhappy, but I'd like to fix it if possible. Can it be fixed without causing further damage? I don't really know anything about modifying electronics, so I'd prefer a simple solution if possible, or maybe there's some kind of store that could fix it for me? If not, my next step is going to be taping some cardboard or fabric over the speaker so I can play at max without blowing my ears out, haha. Thanks in advance!