Be careful from here on, because you are starting to combine figures with a high number of strokes, in this case six strokes per beat, with the other progressions. Listen to each stroke that you play. This type of exercise is very useful for types of music with "swing", e.g. jazz and derivatives such as hip-hop, blues, rap, etc. quarter note = 50-60 Start working at this speed so that you can clearly hear the changes. Remember that some of the changes, such as from sextuplets to quarter notes, involve considerable leaps. Then lower the speed by 5-point intervals until you reach 40. Once you have done this you can increase the speed until you reach your limit. Be very exacting with yourself in your first steps.