text is a tough way to do audio — ⇧ SHIFT — ⌃ CONTROL — ⌥ OPTION — ⌘ COMMAND
Select Unused Tracks
Selects all tracks that have no regions or events.
Select tracks in Logic Pro — Apple Support
Some track operations, such as duplicating tracks or assigning tracks to a different channel strip, require that you first select the track or tracks.
The following table reflects default key commands included in the U.S. factory preset.
Source: Main Window Tracks and Various Editors key commands in Logic Pro — Apple Support
Each of the five separate plugins in the Captain Plugins suite is dedicated to generating MIDI note data for a particular track component. While Captain Drums is the least compelling of the bunch from a songwriting point of view, and Captain Play is essentially a simple chord generator and key/scale limiter, Captains Chords, Melody and Deep work together as a brilliantly interconnected system for creating cohesive bass/chord/melody combinations.
Source: 5 Essential MIDI Plugins — Cool Utilities To Check Out | Production Expert
The Captain plugins are from “Mixed in Key”, the software outfit that Daniel Jalkut (MarsEdit) was working for.
Hide/Show All Empty Tracks
Shows or hides Empty Tracks. Empty is not clearly defined.
An audio track with no regions is not an empty track.
An External Instrument track with no regions is not empty.
Duplicating a track creates an empty track.
Duplicate tracks in Logic Pro — Apple Support
You can duplicate a track, creating a new track below the original track with the same instrument and effects settings. The duplicate track is empty, and does not contain any regions.