Well here's the progress so far. I still need to get the power supply board connected up and then do some testing, assuming it actually works. Then make a box of course.
The two pushbutton switches are for bypass and swap. It can swap the filters between the L/R channels to show the person in the passenger seat what they're missing out on.
The two pushbutton switches are for bypass and swap. It can swap the filters between the L/R channels to show the person in the passenger seat what they're missing out on.