This is a 3x4 button matrix to switch between previously saved GP User Presets of a plugin (here Pianoteq from Modartt).
Enter Edit mode and use the same widget caption like the name of GP User Preset you want to recall. (If the “Customized Caption” of the widget is not “empty” or “” then pressing that button will attempt to load the the GP User Preset corresponding to the widget’s caption.
Learn more → LINK
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