I’m confused

DM10 second kick pad / 12PERC4 input

Hi, I just bought an DM10 Studio drums and I have a few questions about it:

What is the "12perc4" input for? it is not being used on the diagram connection manual...

I also earned a second kick pad for the DM10, how can I correcly connect it to the module and use the two kick pads?
There is any way to use the same "1 kick" input for the two kick drums?

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