To install the SusNote MIDI FX Script, unzip the downloaded package and move the file named 441K SusNote.pst to the following folder. You will have to create the Scripter folder if it doesn’t already exist.
~/Music/Audio Music Apps/Plug-In Settings/Scripter/
After installation, SusNote can be found in MainStage 3’s Scripter MIDI FX plugin dropdown menu.
There are two variations of SusNote — SusNote-U and SusNote-L.
The unlatched version of SusNote requires the sustain pedal to be held for the duration of the note.