#1
So I have 2 Remo practice pads, can I trigger them with Piezo Transducers found at Radio Shack? If so where would I place the transducers, and could I wire them to the corresponding keys on my keyboard that pump out drum sounds?
#3
^very clever

The piezo's on their own would just amplify the 'thud' sound that you get out of the practice pads now (if you wired them to a regular 1/4" output jack and plugged into an amp/computer). To run them through a keyboard, I'd assume that you'd need a midi capable keyboard, and have the piezo wired to a midi cable/port connector, then the keyboard set to send certain drum sounds to the amp/whatever when triggered by the piezo/corresponding midi pin. I think you'd need the midi cable, as keyboards usually have inputs for midi triggers, but not 1/4" ones (other than a standard sustain pedal...), so you'd use the piezo as a trigger through the midi port.

How to actually go about doing this: I haven't a clue (Firstly, I don't know how to get a keyboard programed to do this. After a few minutes with the instruction manual and the keyboard, I'm sure I could figure it out, though... and secondly, I don't know how midi cables work, as I've simply never had to use them in a situation other than plugging one end into something, and the other into something else ).

Just go buy an electric drum kit.
#4
There are tutorials everywhere, just google it...
Anyway, just take the plastic casing off the piezo, coat it in foam and stick it in the practice pad , hooked up to an external jack.
As for sounds, use a module like the alesis D4 or summat like that one, those are the computer-y bits that come with electronic drums.
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Didn't Kerry King use MGs at some point?

I think he just endorses them because he likes sacks of money