 Triggers are also used to add more definition to drum sounds and prevent bleeding between sound sources, making it easier to hear clearly every drum hit without rumble or excessive cymbals.An example is where very rapid bass drum hits become difficult to distinguish or even hear in the presence of a full band.Triggers are used to count and monitor drum hits, usually as a training device (e.g., to see if a drummer misses hits), and to officially monitor tests and competitions of drumming speed.