Two more important symbols used to indicate dynamics are the crescendo (meaning a gradual increase in volume) and the diminuendo (meaning a gradual decrease in volume). These are shown here.
Learning to use dynamics effectively takes quite a while. A good way to practice dynamics is to play a basic rhythm (e.g., two bars of eighth notes) on the snare drum at various different dynamic levels ranging from as softly as you can play to as loudly as you can play. These two extremes are not so difficult although keeping all the notes consistent when playing very quietly can be tricky at first. Most beginners have trouble with making the grades of volume in between pp and f distinguishable, so be patient and keep practicing until you are comfortable with all the dynamic levels shown above. Once you can do this with a snare drum rhythm, play some full drumkit grooves at all the different dynamic levels.
Once you are comfortable with different dynamic levels, start adding crescendos and diminuendos. Once again, start with a basic snare drum rhythm until you are comfortable with gradual and consistent volume changes, then try crescendos and decrescendos with beats and in particular, fills. A drummer with good control of dynamics and timing will always be in demand with other musicians and well appreciated by audiences.
Observe the dynamic markings in this example and listen to the recording to hear how effective they are when combined with other instruments. Try playing some of the grooves and fills you have already learned at different dynamic levels. The more you practice and play, the easier this becomes. Notice the use of the bar repeat sign in this example.
Electronic drum kits work by using sensor pads in place of drums and cymbals which are connected to a processor (sometimes called a drum brain). This gives them generic qualities and features. The sample libraries in these processors can store thousands of sounds, meaning that a huge number of kits and effects are available to the user. Modern kits have very sensitive pads that can approximate differences in tone and volume and the materials used can come close to recreating the feel of acoustic drums.