Yamaha DTXpress/DTXplorer/DTXtreme

Just use the B diagram Keith provided in the files section without R1 
and VR1.  

Parts for Yamaha KP65 drum trigger (radio shack part number):
1x 1.0µF 35V 20% Dipped Tantalum Capacitor (272-1434) or any other 
1µF-3µF cap. I stole one from a bad power supply 
1x 1M-Ohm resistor (271-1356)
1x NPN transistor 2N3904 (276-2016) or 2N4401 (276-2058).  I felt 
that the 2N3904 worked better but who knows.  
1x mini-board cut down to ¼ (part #276-148)
1x shielded cable with 1/8" headphone plug stereo or mono (42-2387) 
www.radioshack.com only had stereo so I wired the black to the shield 
where to make it a mono cable.
Optional: 1x Enclosure box for the project; (270-1801) 
Optional: 1x three-conductor 1/4" stereo phone jacks (274-312B) 

If you are making your own trigger:
1x 1K Ohm 1/4-Watt Carbon Film Resistor (271-1321) - R1 in Keith's 
diagram
1x 100k Ohm VR (271-284) – VR1 in Keith's diagram.
1x Piezo Element 1500-3000Hz (273-073)

Take a look here http://www.rockband.com/forums/showthread.php?
t=11121&page=4 to physically build the components, just don't 
use any 
of the diagrams there.  

I also used a 1¼ hole saw (metal cutting bit) in a drill press to nip 
two semi circles out of the KP65 stand.  This is to allow the kp65 to 
fit over the back support bar of the RB drums I removed the bar 
closest to me.  I made the holes in the stand just behind where the 
stand meets the upright (if that makes sense).  You could probably 
just use a grinder since you don't have to take much out of the 
stand.  I'll post a diagram and pictures if I have time.

-Jeff 
This post is supplied as is with no written or implied warranty and 
I'm not responsible for any damage you do to your RB drums, Xbox, or 
yourself.