I'm having a little bit of trouble with my amp, particularly my volume pot. Sound usually comes out fine on the left channel, but there's nothing coming out of the right. When I turn the knob really quickly and it makes a clicking noise, only then does sound come out of the other side, but only for a short while, and sometimes the sound disappears on the left side when I do this. Defective pot, or what? I think I accidentally touched the pot directly with the soldering iron a little too much, because I see little melt-dots on the plastic casing. Could I have overheated it?