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4 pickups

Hi, I am building a custom bass. 6 string, tuning F# B E A D G. and to get that low F# i am using the MEC twin jazz bridge and jazz neck like the Warwick Dark Lord. Unfortunately, these do not come in 6 string pickups, only four. So, i decided to have an MEC MM bridge and P neck pickup for the top four strings (EADG) so i could essentially switch between a four string or a extended range 6 string. By the way, the TJ, J, and P pickups are active while the MM is passive. To top off these crazy electronics I wand a 3 band active EQ with mid range selector. So to sum up: 4 pickups, 1 passive, 3 active, and active 3 band EQ. I have three questions now:

1) how many batteries do i need?

2) i have decided on 3 balance controls: 1 between the TJ and the J on the bottom 4 strings, 1 between the MM and the P on the top four strings, and 1 between the two pairs (TJJ and MMP). How could i wire this and have the EQ section i want?

3) how would i ground all of that?
 

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