I have a bass with p pickup and a musicman humbucker. I want to replace those with EMG pickups. I have looked at the site of repective pickups and it says that they come with EMG's exclusive Quik-Connect ª cable, prewired solid shaft volume / tone control set, output jack, battery clip set, adjustment screws. I would like to have volume volume tone controls. Do ineed to purchase extra controls to have wire it like that? (it already comes with prewired controls) Grateful for answers 