AB Box. Two guitars to one amp

[Buffalo Tom]

Hi. Can I use this circuit without modify and use it the other way around.
Two inputs to one output? 
http://www.fulltone.com/sites/default/files/manuals/fultone-a-b-switcher.pdf

Thanks!

[vigilante397]

Are you referring to plugging in two guitars then using them one at a time, using the box to mute the one not being used? Because in that case it would work.

[Buffalo Tom]

Are you referring to plugging in two guitars then using them one at a time, using the box to mute the one not being used? Because in that case it would work.

Yes exactly. I wanna switch between two inputs (guitars) to one output (amp).