The documentation for Logic Pro Midi says rather cryptically "The Scripter plug-in has one global parameter." But it doesn't say what that global parameter is. What is it? And is it global within the instrument, or within all scripts running in all instruments in a particular song?
What is Global Parameters?
All GUI enabled user defined controls are displayed below the Global Parameters as 'Script Parameters'
Is it global within the instrument, or within all scripts running in all instruments in a particular song?
The script has a channel strip specific scope
The Global Parameter opens the same Script editor and hence has a global scope (will run the same script in exactly the same way across Logic) BUT the user written script has a channel strip specific scope i.e. when the script on a channel strip is run, it will affect the components of that specific channel strip only.