Native Instruments MASCHINE MIKRO MK3 Groove Production Studio (Black) - Manual (Page 488)

4. If the Mixer currently displays the Group channels, in the top row of the Mixer double-
click the header of the Group containing the Sound you want to configure. If the Mixer
currently displays the Sound channels, single-click the header of the desired Group.
The Mixer displays the channel strips of all Sounds in the selected Group.
5. At the top of the channel strip of the Sound you want to configure, click the first field
under the Sound name and select the desired external input in the menu.
This is equivalent to setting the Source parameter described above.
Audio Routing, Remote Control, and Macro Controls
Audio Routing in MASCHINE
MASCHINE MIKRO - Manual - 488