MainStage Remove screen control mappings
If you want a screen control to be free of any mappings, you can remove its existing mapping. This can be useful with controls that pass through MIDI messages (for example, for pitch bend and modulation wheels, or expression pedals) when you do not want them to send MIDI messages for their pass-through control type. You do not need to remove the mapping for a screen control when you remap it.
Reset the mapping for a screen control
In the workspace, click the screen control you want to map.
In the column on the left of the Parameter Mapping browser, click None.