Robert,
The Boss LS-2 will do what you need. In A<>B mode, you can plug your 6 string neck in to the “input” of the LS-2, and your 12 string neck in to the “return B” jack. “Send A” can go to your 6 string FX and amp. “Send B” can go to your 12 string amp.
Step on the switch, and toggle between the two, one at a time. You even have a level controller, if desired, for each(boost/cut). Also an indicator light for each.

I just set it up to try...worked fine.
The Boss LS-2 will do what you need. In A<>B mode, you can plug your 6 string neck in to the “input” of the LS-2, and your 12 string neck in to the “return B” jack. “Send A” can go to your 6 string FX and amp. “Send B” can go to your 12 string amp.
Step on the switch, and toggle between the two, one at a time. You even have a level controller, if desired, for each(boost/cut). Also an indicator light for each.

I just set it up to try...worked fine.





