Native Instruments MASCHINE MK3 Groove Production Studio (Black) - Manual (Page 588)

2. Drag and drop the multiple selection onto the desired Sound in the Sound List.
→ New Patterns will be created for that Sound in the Group, each new Pattern receiving the
data from one of the MIDI files. Only this Sound will contain notes in these new Patterns.
Apart from this, each MIDI file will be imported as a single MIDI file to that Sound — see
above for a detailed description.
Alternatively, if you have selected the MIDI files in the FILES pane of the Browser, simply press
[Enter] on your computer keyboard to import the multiple selection to the focused Sound!
Working with Patterns
Importing/Exporting Audio and MIDI to/from Patterns
MASCHINE - Manual - 588