Dance Pad noise reduction?

[jlg]

I live on the 2nd floor and my floor is hardwood. If I go crazy on the dance pad I'm sure it can be very anoying for the neighbors under me.

I'm thinking of moding my pad like this: http://www.ddrfreak.com/library/faqs-modding.php for a better feel.

I need ideas on how I could make it so the neighbors don't ear me banging on the floor. I was thinking about putting some sort of foam under. What would be the best material to use? any other idea?
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[orionrobots]

The mod is a good start. You probably (for noise reduction, and safeties sake) want to put some weight distributing grips, which stop it sliding around, and find a way to make sure if you are springing on the pad, that its not springing off the floor with you - so it is well tethered with say a flexible rubber system.
Could it possibly be done with a few of those rubber doormats (the one with the shaped latices) laid under the mat?
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