One of the coils went out the other day on my 71' P Bass during a gig. The volume obviously dropped to half - but the resulting sound was interesting -- really aggressive and thinner (in a cool way). I'm sending it off to be rewound, and, in the meantime, it got me thinking...has anyone ever put a blend knob (or separate volumes) on their P Bass - so that you can control each coil separately? I'm assuming that there would be a hum - but it could be a useful studio tool for getting some different tones. I ran the idea by my luthier and he said it would be simple to do - but he had never heard of anyone doing it.