Selecting All from Timebase Rulers
To select all material in all displayed audio and MIDI tracks:
Double-click in any Timebase ruler. All clips in all displayed audio and MIDI tracks are selected. Tracks that are hidden are not selected.
To select all material in all tracks, including Conductor events:
While pressing Option (Mac) or Control (Windows), double-click in any Timebase ruler. All clips in all displayed audio and MIDI tracks are selected, including all events in each of the Conductor tracks.