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I've got a friend who majored in percussion and he told me that the drummer from Fear Factory uses a timer (I forget the exact jargon) so that for each pedal he presses, two sounds are created. Basically, he's creating a double bass drum sound while only having to use one pedal.
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I had never heard that story. Judge for yourself:
http://youtube.com/watch?v=zL-Sbpw0j...mond%20herrera
He does use "triggers" though. Instead of recording the actual bass drum sound, his bass drum tells an electronic drummer to make a bass drum sound. Wiki says he does that because a natural bass drum sound would be too muddy.