This short clip from Ableton's Learn Live series covers the Flam ornament in Live 12's MIDI Transformations, demonstrated on hi-hats. Flam adds a ghost note just before or after each MIDI note, with a position slider to control timing and a velocity setting defined as a percentage of the original note.
Applied at low velocity, the effect is subtle but effective: hi-hats gain a slight stagger that breaks the mechanical feel of a programmed beat without sounding obviously processed. It's a fast, one-parameter trick worth keeping in reach any time a drum pattern needs a more human touch.