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I am pretty sure that 1 is volume, 3 is blend, 2 + 4 forms a 3 band EQ, and 5 is a slap contour switch.
I've heard great reviews about installing a aggie OBP3 on that bass...
I am about to install one in my gb75 (Indonesian). I will be sure to post when I am done! I expect greatness and I am hoping I can live with the pickups when I am done.