The Plug-In Settings dialog lists the presets for the current plug-in type. From this list, you can audition and select presets.
Use the Folder pop-up menu at the top of the Plug-In Settings dialog to switch between plug-in settings subfolders, or root and session settings folders.
This pop-up menu lets you switch between presets located in root or session folders (and any available subfolders).
This option lets you audition plug-in presets in series by automatically scrolling through them for a specified number of seconds.