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Send unused program changes to channel strips in MainStage
In a MainStage concert, you can send program change messages that are not used for switching patches to channel strips for changing plug-in presets and other functions.
Send unused program change messages to channel strips
In the MIDI tab of the MainStage Concert Settings Inspector, select the Send unused Program Changes to Channel Strips checkbox.
For information about setting program change numbers for patches, see Set program change and bank numbers in MainStage.