Editing : Making Selections : Selecting Track Material

Selecting Track Material
For more information, see the following topics:
Before audio and MIDI material can be edited, it must first be selected. The Track View determines how the material is viewed and selected.
When you make a selection, it appears as a highlighted area of the tracks, and is also indicated by blue start and end arrows (Timeline Selection Markers) in the Main Timebase ruler. If any track (audio or MIDI) in the session is record-enabled, even if it is hidden, these markers appear red.
 
If the Timeline and Edit selections are unlinked, the Edit selection range is indicated by Edit Markers in the Main Timebase ruler. See Linking or Unlinking Timeline and Edit Selections for details.
Selections and Edit Groups
When making selections on tracks that are part of an Edit Group, all tracks within the group become selected.
Selections and Hidden Tracks
When editing tracks that are part of an active Edit Group, any tracks within the group that are hidden are not affected by the edits. To edit all members of a group, make sure they are visible by highlighting their names in the Track List.
Selections in Multiple Tracks
To make a selection in multiple tracks:
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With the Selector tool, drag vertically to include adjacent tracks in a selection (drag horizontally to define the time range).