[garageband]

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Lacking a round-robin feature, identify two snare samples in your bank. Figure if your roll makes musical sense to be a double (LlRr) or single (LRLR) or paradiddle (LlRL-RrLR). Also use velocities to crescendo or add odd accents as musically helpful. This will camouflage the fact the you are using samples. This technique is also great on high hats and ride cymbal samples.