Does a usb footswitch work in guitar rig, so I can switch between presets? It can perform any keyboard action, key combination or mouse button emulation

Or do I really have to buy a midi footswitch?
just one more question. Do you know the keys to switch between presets or where I can find them?
thank you
go to options in guitarrig and there you can "learn" any key and assign it to anything in the "menu" drop down list