231. As you all know well, this is one of the most commonly used rudiments. There are two ways of doing this exercise: using the Bounce-Roll, with a more closed sound, and without the Bounce-Roll, dominating each one of the beats. I’d suggest using the system of exercise 230. In this exercise we go from using right hand-left hand to combining with snare drum-bass drum. Do so in an ambidextrous way.