EMG pickups have to be in parallel. The TW will have its own push-pull volume pot that you would just add to the wiring of your existing setup. The CS could be done similar by just adding a volume pot. You don't need to have a strat style switching system, you don't even have to have switches, just a spot for another hole and pot. You don't need a blend either. Blending would only work for two inputs anyways, requiring you to add a switch for at least one.
Switching can be done, and a 5 way strat switch would be best. It's all up to how you want to select your pickups. But the TW will need a push/pull selection; and since I have not used one I am not sure if that requires you to use the EMG included pot which is setup for it already or if any 25k pot with push/pull on/on switching will work. You could take a look at the Musicman Big AL and see how they did 3 pickups with selector buttons. Same with a particular Godin bass that had three pickups, which used a strat switch. There are lots of ways to do a 3 pickup bass.
I just saw a ibanez bass on facebook with an EMG DC in the neck and two EMG J's in the bridge. That bass had a switch for the bridge pickups and used a blend to mix both pickup positions.
"But lay up for yourselves treasures in heaven, where neither moth nor rust doth corrupt, and where thieves do not break through nor steal:" Matthew 6:20
Last edited by joelb79 : 01-27-2013 at 02:27 AM.