The transitions determine whether the roll flows
The Carretilla is a rapid sequence of individual finger strikes, not a simultaneous squeeze with four fingers. In the usual playing style, the right hand takes the role. For this exercise, keep your other hand still so you can clearly hear each tone and each gap. The slowly counted groups of four are a learning aid, not yet a rhythmic pattern for a particular Palo.
Even means that roughly the same amount of time passes between neighboring strikes. Often the index finger rushes ahead, while the transition from the ring finger to the middle finger takes longer. The sequence then sounds like two pairs instead of one continuous roll. More force will not eliminate this gap. It comes from the timing between the fingers, not from a lack of volume.
You can release a finger that has already struck while the next one strikes. So you do not wait for your entire hand to get ready again after each tone. At the same time, keep the movements small enough that no finger has to swing far back. A similar listening principle can be heard in the Cramp Roll with four clear sounds in tap dance: A rapid sequence must not lose its individual parts. For longer practice sessions, it also helps to follow the principle of increasing the strain gradually when dancing, instead of continuing to play with tired fingers.


