Say what now? How’s that possible?
It's magic. It helps to know the magician. In my case, that would be Michael at
Turnstyle Switch. The link goes to his pro-shop page, to the first bass he did for me -- a 3-pickup jazz.
The switch itself is just a six position rotary switch. But it's not a mere pickup selector tool, it's capable of way more than that. Think of each position as a blank canvas, and you can put anything you want on it. You tell Michael what exactly you want, and it's his job to make it happen.
The controls on this bass are going to be three individual volume controls, a master volume, a master tone, and the Turnstyle. Position one on the Turnstyle will be full manual control into a mono output. The rest of the positions will be stereo-capable tone presets. So far, I have decided on Rickenbacker, Thunderbird, an aggressive-sounding Jazz, an overdrive, and I haven't decided yet on the last position. You could as easily pick a Gibson EB3 or Hofner or Danelectro Longhorn.
The stereo won't be active unless I have two cords plugged in. Most of the time there will just be one cord and one amp. But when there are two cords and two amps, one side will get the E/A strings and the other side will get the D/G strings. That's going to allow me to do some really interesting things.
By the way, I'm an unpaid endorsing artist for Turnstyle, so if it seems like I'm talking it up, I am. But I wouldn't do it if he didn't produce a great product. That 3-pickup jazz has been my main player since it came into existence. It too has six different voices.
Anyway, that's how it's possible.