Ableton's official Learn Live series walks through one of Granulator III's more useful workflow details: the Modulation display is context-sensitive, meaning it updates to show only the modulations available for whichever control is currently selected.
The bit demonstrates this by adding random modulation to the Position control, so that each new note triggers grains from a different, unpredictable point in the sample. The result is a simple way to introduce organic variation and textural randomness into granular patches without manual automation.