In what ways are triggers cheating? Theoretically that could be done but I have never heard of anyone ever doing this in a proper death/extreme metal band. This would be considered cheating, REALLY cheating. The reason most people use triggers at those speeds of say 200bpm+ is due to the physics surrounding a bass drum. Even considering the fact that at high speeds two bass drums will usully be used, say 7-9 strokes a second may be played (in a musical setting) per drum. Considering the sound in a bass is produced through air shifting within the drum, at these speeds the notes become a mush as there isn't really any time given for the air to replace itself. What triggers do is send an electronic signal to the drum brain every time a strike is made which then outputs a sample, by putting the trigger sensor on the batter head or pedal of the bass drum. This means a clear sound can be produced for every strike of a drum hence making the sound far nicer and cleaner, as opposed to the mush heard if the triggers were not used. That wasn't a very good description but I hope you understand. In short; Yes you can assign a trigger to play 2 sounds for every strike but nobody does this, at least not in the respectable arena.