A trigger pad is an electronic sensor on a drum that produces a certain sound assigned from a sound module once the head has been struck. This device allows drummers to play at a constant dynamic regardless of the physical force used.
Triggers are also used to add more definition to drum sounds and prevent bleeding[when defined as?] between sound sources, making it easier to hear clearly every drum hit without rumble or excessive cymbals. An example[according to whom?] is where very rapid bass drum hits become difficult to distinguish or even hear in the presence of a full band.
Triggers are often used as a way to count and monitor drum hits, usually[according to whom?] as a training device (to see if a drummer misses hits, for example) or in speed attempts. Mike Portnoy uses an electronic drum pad with a hardwired electronic metronome as what he calls the "secret cowbell", to count off the songs in a way that only his fellow band members and the technicians can hear it. Tim Waterson, the current world record holder as stated in the Guinness Book of World Records, uses trigger pads to record his speeds.