Native Instruments MASCHINE MIKRO MK3 Manual page 530

5. At the bottom of the channel strip of the Sound you want to configure, click the bigger
field left and select the desired MIDI port in the menu.
This is equivalent to setting the
6. Click the little field on its right to select a MIDI channel.
This is equivalent to the
Dest. parameter described above.
Channel parameter described above.
Audio Routing, Remote Control, and Macro Controls
Using MIDI Control and Host Automation
MASCHINE MIKRO - Manual - 530