I do these things so you don't have to.

[Starshot]

Because I'm making a life-size controller for Amplitude, it requires me to open a DDR pad. I thought I might as well take pictures to help people out.

Bottom:
http://i2.photobucket.com/albums/y31...y/S6300098.jpg

Top:
http://s2.photobucket.com/albums/y31...h_S6300101.jpg

Circuit Board (Top):
http://i2.photobucket.com/albums/y31...y/S6300100.jpg

Basically, the top mat must come in contact with the bottom. When it touches, it accepts that as a step, and when you leave it on there, it accepts it as a hold. When dismantling this badboy, I noticed that the top and bottom sensor don't have to match up for the proper input. Only the bottom sensor sheet determines what the input will be.

For example, if I take the bottom sensor pad for the down arrow and put the up arrow sensor of the top bad on top of it (Thus, making an input), the input is down. The top pad is only there to complete the circuit.
To make a rudimentary outline:

Circuit Board->Lower Pad->Upper Pad

Therefor, as long as the circuit is completed, the input will work. The pad is so low voltage though, that I've gotten electrical tape out, and it takes place of the upper pad just fine. Of course, there's still that issue of finding a way to keep them separated if you already threw out the foam separating them.

Will post more as I continue to work on this controller. Feel free to ask questions.