Some MIDI modules, like the FlexPhraser, process the MIDI events themselves. Other MIDI modules, like True Pedaling, produce modulation signals that must be assigned as a source or as a modifier in the modulation matrix before they can be used.
Procedure
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In the Program Tree, select the zones that you want to edit.
Make sure that the zones are part of a program or layer with a MIDI module that produces modulation signals.
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Open the Sound editor and show the Modulation Matrix section.
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On the pop-up menu of the Source/Modifier column, open the Modulation Module submenu and select a MIDI module.
The submenu lists only MIDI modules that belong to the same layer or that are higher up in the hierarchy.