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Block incoming controller messages in MainStage
You can block incoming controller messages that you do not want MainStage to process. To block incoming controller messages, the controller must not be assigned to any screen control.
Block unassigned controller messages
In the MainStage Assignments & Mappings table, select the text “Unassigned” in the Assignment column.
In the Screen Control Inspector, deselect the Send all unassigned MIDI to Channel Strips checkbox.