a trigger is pretty simple. when you it the head of your drum, it sens an electric signal, a peak, that is as high as you hit. Drumagog use this peak to select a drum sample, depending on how high the peak goes, so a harder hit will trigger a louder and harder sample.
a roland td-6 is a drum module. it use the same function as drumagog, but has internal sounds sample and has the capacity of converting analog trigger it into digital, a midi note. if you hit the bass drum, it will trigger a C1 midi note, like if you where playing on a keyboard with the drum fonction activated. all the midi notes can be sent out in one midi cable, you can then plug in your computer so you can edit you drum via a virtual "keyboard", such as cubase.
Drumkit from hell simply takes the midi notes and triggers it to the sound of the note, again with the velocity of the hit.
drumkit from hell is basicaly 40gig of drum samples. when you do a hard snare hit, it will trigger a hard snare, depending on the snare sound you choose. you can choose if the snare/kick/hat whatever you want bleeds through the overheads and tom mics or no, giving all the posibilities you can have.
try the radioshack piezo if you have cubase and you will understand all in 2 seconds. there is drumkit from hell superior vintage if you feel more like bluesy of jazzy.
hope its clear.
