Yeah, the switch is for active/passive. I was talking about the stacked knobs, which give this bass a total of six knobs, as compared to the five that other Ibanez have. As I suspected, the additional knob is a mid sweep control.Pretty sure that's a mini toggle switch for the mids. 250hz to 2.5kh.
Or maybe passive mode
I'm seeing good numbers for weight so far - how heavy is yours?