On my mysterious samick p-copy I have three unlabelled knobs. After an entire year of owning the thing, I just now realised that it doesn't have a volume control, but two of the knobs control the volume coming out of the pick ups they are closest to. However, the third knob remains an enigma to me, or at least it's puzzling me a little bit; when I turn it right up static comes out of the amp when my hands are not on the strings, and the tone becomes 'clanky' somewhat, emphasising slides (and poor fingering!) When down, the tone is 'muffled'. So my first question is, what is this knob? my assumption is that it's a tone knob. My second question is, what are some good bridge configurations for different tones? I've found that the bridge pick-up soloed gives a punchy tone, whilst the middle(?) split jazz (I think, or is single the P?) soloed gives a 'rounder, fatter' tone.