Ok, so i just wired up my line splitter, and im really confuzed. Its a super easy thing, and ive looked at the schematic side by side to it 100 times. The problem is that no matter where the toggle switch is, the guitar AND the tuner signals are both engaged. WTF??
I'm not totally sure what you mean by the guitar AND the tuner signals are both engaged. Do you mean you still hear the guitar through the speakers and see it on the tuner as well?
If tha's the case, I would put it down for a few hours and then compare your wiring to the diagram again later. You're missing something.