Wait a minute. What are you talking about here?
Drum computers in which you need to program a rhythm or
electronic drum kits using pads you have to hit with a drum stick, just like when you'd be playing a real drum kit? (there is also a variant with only some hit pads:
http://www.audio-depot.com/images/PerformancePad_lg.jpg) The trigger thing you brought up got me confused about what you want, as that would be a drum kit playing without a drummer sitting behind it. Essentially a drum computer with a real drum kit as sound creator (output), whereas the electronic drum kit uses a sort of drum kit as input.