MIDI Mapping
Click "Midi Mapping" from Setting in the top left
UI elements that can be MIDI mapped turn blue, and a window called UIInspector is displayed.
UIInspector shows the MIDI channel and MIDI number currently mapped to the selected UI element.
When you click on a UI element, it turns red.
In this state, if you move the MIDI controller you want to map, that UI element and MIDI controller will be linked.
Some modules in NodeEditor can also be MIDI mapped.