This Learn Live 12 walkthrough tackles a common frustration with randomized MIDI: individually probabilistic drum hits can feel chaotic, with too many extra notes triggering in one loop and none in the next. The fix uses Ableton's probability groups to make incidental snare variation feel intentional rather than accidental.
The example starts with a snare pattern locked to beats 2 and 4, plus extra incidental hits each set to a 40 percent chance of playing independently. Because those probabilities run separately, the fills stack unpredictably from loop to loop, sometimes crowded, sometimes empty.
Grouping the incidental notes and choosing the Play One mode changes the behavior entirely. Setting the group's overall probability to 100 percent guarantees that exactly one of those hits fires every loop, giving you consistent, controlled variation instead of random clutter.
The core idea transfers well beyond snares: whenever you want