Wiring Sansamp gt-2 switches.

[MmmPedals]

I have 3p3t switches I would like to use for a sansamp gt-2. They have 4 lugs like this http://www.taydaelectronics.com/electromechanical/switches-key-pad/slide-switch/slide-switch-2p3t-solder-lug-5-5a-250vac-1815.html but with a 3rd pole. could it be done? how?
Using tonepad layout here http://tonepad.com/getFile.asp?id=112
I understand the switch, but not the schematic.