Recently bought a used Warwick Thumb from 1994, it plays amazing but the electronics don't seem to be working properly. For example when I turn the volume knob I get a really loud "white noise" sound when it isn't either maxed or off completely. And the treble pot can't be turned from the 12 a'clock without it making a similar white noise. Anyone know what could be wrong? I have very little experience when it comes to electronics so I am at a complete loss.