Apple Logic Pro X - Manual (Page 58)

Chapter 2 Get started with Logic Pro X 58
Add a track to a Track Stack
m Drag the header of the track you want to add between two of the subtracks in the Track Stack.
Note: When you add a track to a summing stack, its routing changes to the aux assigned to the
main track.
Reorder subtracks
m Drag a subtrack by its header up or down inside the Track Stack.
Remove a subtrack from a Track Stack
m Drag the subtrack outside of the Track Stack (below the last subtrack, or above the main track).
When you remove a subtrack from a summing stack, the track’s output routing changes from the
aux used by the main track to the main outputs.
For more information about using Track Stacks in your projects, see Track Stacks overview .