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Track stacks and the Library in Logic Pro for Mac
The patches available in the Library vary depending on the track stack type, and on which track in the track stack is selected:
When the main track of a folder stack is selected, no patches are available in the Library, and patches can’t be saved.
When the main track of a summing stack is selected, the patches available in the Library depend on the channel strip types of the subtracks.
For both types of stacks, when a subtrack is selected, patches for the appropriate track type are available.
If you choose a track stack patch when a subtrack of a folder stack is selected, the entire track stack is loaded into the folder stack.