The Max Roach étude, again. By playing it faster, I observed that I go off tempo on bars 5-9, with these off-beat quarter notes triplets that switch toms. (The figure for bars 5-6 is: | ..O .x. O.x .O. | x.O .x. ..O ..O | where O means a fla, two very close strokes, and x a single stroke, and you can hear that it moves on toms: snare, low, snare, high.) Of course, when I tried to played it slow, I lost tempo too. That'll be work for the next few days!