Using capacitive touch switch as guitar pick-up selector
Thats a really cool switch, the datasheet, not so cool.

It appears that they have a microcontoller in the switch (I am not 100% sure), it toggles two 
wires called out1 and out2. Information on how it toggles the lines is not information that is available because this datasheet is horrible.

The only information given is out1 and out2 are most likely conntected to an optomos relay, if the optmos is between ground and out1, or out1 and out2 is not described in this crappy datasheet. 

I'd get a meter and ohm it out and complain to the company.