I've had 3 and 4 pickup basses,the 3 pickup one was a 1973 ? Fender Telecaster bass with the neck humbucker as standard,but with added P and J pickups in their respective positions,it had a fantastic array of sounds,the only reason i got rid of it was because of the weight which was way heavier than any bass that i've owned before or since,and my current one is roughly 12lb.That and the uncontoured body just made it uncomfortable.If i remember right it had 3 vol,1 tone and a Strat 5 way switch.
The 4 pickup bass is an Italia Modulus Tipo 3,with 4 lipstick pickups mounted vertically,which has undergone serious modification to replace the pickups,one of which failed,and now has a soapbar at the bridge and a mudbucker in the P position.