Methodically increase the time between hits and then decrease that time within a defined distance.
This will often give an illusion of the rhythm speeding up and slowing down. This illusion is experienced by the listener but not the player. Within the player’s body, time stays constant. This formulaic approach provides the ability to lay out parts in which various phrases converge and diverge purposefully.
To once again use the gear analogy, this strategy is then combined with STRATEGY A to create combinations of elliptical gear pairings, placing further demand on our listening.
The above clip utilizes this strategy in a form similar to a wave packet. This is best explained using a couple images. The left side of the drum set plays a short simple pattern in which the time between instances of the short pattern is defined by the red curve similar to the one in to Figure 1. With time moving left to right, the time between the short patterns gets gradually shorter until it reaches the center. At which time, the time distance starts to expand.
On the right side of the kit, a small pattern (different than the left pattern) is repeated with the time between repetitions based on a function defined by a curve similar to the blue one in Figure 2 below. The resulting effect produces two separate 'slowing down and speeding up' effects as well as an increasing and decreasing rhythmic density through a cycle.