MainStage Send unused program changes to channel strips
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 Concert settings, click the MIDI tab, then 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.