Native Instruments MASCHINE MK3 Groove Production Studio (Black) - Manual (Page 527)

Action Function
[Alt] + drag note Duplicates selected notes. When you drag horizontally, the
copies are moved in time according to the Step Grid (see
quantizing rules below).
Drag left/right note border Moves the start/end of selected notes according to the Step
Grid, thereby resizing the notes (see quantizing rules
below).
[Ctrl] + drag left/right note
border
(macOS: [Cmd] + drag left/right
border)
Freely moves the start/end of selected notes (overrides the
Step Grid quantization), thereby resizing the notes.
Drag note vertically Group view: Moves selected notes to another Sound of the
Group.
Keyboard view: Transposes selected notes.
Double-click note Deletes selected notes.
Right-click (macOS: [Ctrl]-click) Deletes selected notes.
If multiple notes are selected, mouse actions can be performed on any of the selected notes —
they will apply to all selected notes.
If you perform any of the actions listed above on a note not included in the current selection,
the selection is dropped and the note you are editing will be the only note affected by your
edit.
Quantization when Editing a Single Event/Note
By default, all dragging actions on the time axis are quantized according to the Step Grid:
▪ When you drag a note (or its duplicate) horizontally, its original offset with the Step Grid is
preserved, unless you drag the note near a grid line — in that case it will snap to the grid.
▪ When you resize a note by dragging its start/end border, the new start/end border will snap
to the Step Grid.
Working with Patterns
Editing Events
MASCHINE - Manual - 527