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This is the way that worked for me after following one of the tutorials on how to build a custom electronic kit. I hope this helps. feel free to ask any questions and I will answer what I can or point you in the right direction. UPDATE ! After finishing this tutorial I have learned a lot more about trigger sensitivity and electronic drumming. Mikej's approach to triggering is best utilized when you want to have a dual-zone drum such as a snare (head+rim) or just add sounds to the rims of your drums if you happen to have enough inputs on your module. My approach works fine for single zone drums, and you can still use Mikej's approach on the drums you need to be dual-zone.
Step 1
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Start by selecting the drum you want to cut. (one tom makes 2 drums if the hardware is present meaning rims on top and bottom) measure the half way point and mark it with something that you can remove unless you are going to paint the drum then it doesn't matter if you use something more permanent. as the old saying goes: " Measure Twice, Cut once" I didn't care much about precision but if you do then follow that advice.