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I think I know this one....
I think what you may have there is a peizo blend setup.
I believe you may have to run the peizo signal through another amp....like a stereo jack setup. The blend knob allows you to go p-90 by itself, peizo alone for a more acoustic tone, or a blend of the two(very cool effect, btw). I've seen this on some Parker solid bodies I've played.
I'd contact a good Gibby dealer to be sure, but I bet that's it.
Otherwise....how do you like that thing?
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