Hey. I want to replace the preamp in my bass with the darkglass tone capsule. My bass comes with 3 slots for potentiometers and the darkglass has volume, bass, mid and high mid controls. Is it possible to wire it so that the mids are using a stacked knob? And if so, what kind of potentiometer are we talking about? Any info would be appreciated. The bass in question is a warwick thumb. Thank you.