Round robin (sampling)
Recording the same note several times and letting the sampler cycle through the takes, so repeated hits don't sound identical.
When a sampler fires the exact same snare hit sixteen times in a row, the ear catches it instantly: the machine-gun effect. No real drummer ever plays two identical strokes. The fix is to record three, four or sometimes twenty variations of each note and have the instrument step to the next one in the queue on every hit.
It's usually combined with velocity layers, so a soft and a hard hit are different recordings too. That multiplies quickly: 88 keys times eight layers times four variations is thousands of files. It's why Kontakt libraries are measured in gigabytes, and why SFZ has dedicated opcodes for describing the rotation.