Hi all, as the title suggests, I'm contemplating adding another pickup, or two, to the neck position of my fretless Warmoth J Bass. It currently has one Bartolini MusicMan Dual Coil in the "SweetSpot" position. It has a 3-way switch for Bridge/Series/Neck. I have an older Bart preamp, too, so it already has 6(!!!) control routes. The bridge setting by itself is a bit thin. The neck setting is okay, but I usually end up switching to Series after a few minutes. This gets great fat tone & I wouldn't mind hardwiring it that way. For more useful changes in tone, I just pluck from different positions, but it's still not versatile enough. At the very least, I'd like to add a P, or perhaps another MM, to the P-Bass location. Further on down the road, I may also want to add a neck J (CBJD-1 split coil, same model as with their P/J combo) against the end of the fingerboard, like those short-scale Beatle basses. Also thinking of going passive, fyi. I want to use it for funk, jazz, and soul, and hope to get a vast array of tone, from modern/growly/punchy to vintage/muted/"upright (but nothing like a real upright)". Long question short: Can I combine these Bartolini pickups off-the-shelf? Or do they need to be specially made for each other?