Apple Logic Pro X - Manual (Page 23)

Chapter 2 Get started with Logic Pro X 23
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Library: You can audition patches and choose a patch for the selected track in the Library.
A patch contains the instrument, effects, and routing settings that control the sound of a
track. When you choose a patch, those settings are applied to the currently selected track. The
Library shows available patches for the selected track. You can choose a category on the left to
see available patches or subcategories on the right.
In addition to patches, you can view and select plug-in presets and other settings in the
Library, when the corresponding item is selected. For information about choosing patches and
other items in the Library, see
Patches overview .