A/B to A/B

[dandamantk]

Hey diy'ers,
Im interested in building an a/b to a/b switch pedal. For example,  I would like to have a guitar and bass plugged into the a/b portion of the input. Then,  I would like to have one of the outputs to the amp and the other to act as a killswitch so there's no noise when changing instruments. How would I go about wiring this, there would need to be two footswitches (one for the input selector and one for the outputs.) any help?

Thanks,
Danny