Mixing : Basic Mixing : Bus Interrogation Options

Bus Interrogation Options
Pro Tools lets you select or show tracks based on the track input or output assignment, send assignment, or hardware insert assignment. This can be useful for quickly identifying all tracks that use a specific input, internal bus, output bus, or hardware insert.
Right-click the assignment selector and choose from the following options:
Select Assignments To
This option selects all tracks that use a specific input, internal bus, output bus, or hardware insert.
Show Assignments To
This option shows all tracks, including hidden tracks, that use a specific input, internal bus, output bus, or hardware insert. All other tracks remain shown as well.
Show Only Assignments To
This option shows only those tracks that use a specific input, internal bus, output bus, or hardware insert. All other tracks are automatically hidden.
Restore Previously Shown Tracks
This option restores the previous state of shown and hidden tracks. This option is only available if tracks have been hidden by using the Show Only Assignments To option.
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Press Option (Mac) or Alt (Windows) while Right-clicking and selecting any of the Bus Interrogation commands to apply the command to all related paths and sub-paths. For example, Press Option (Mac) or Alt (Windows) while Right-clicking an output selector and choosing Show Only Assignments To Bus 1. If Bus 1 is a sub-path of Bus 1–2, all tracks using path Bus 1–2, and all tracks using sub-paths Bus 1 and Bus 2 are shown, and all other tracks are hidden.
To select tracks based on the track Input or Output assignment, Send assignment, or Hardware Insert assignment:
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Right-click the assignment selector and choose Select Assignments To for the bus you want.
 
To show all tracks based on the track Input or Output assignment, Send assignment, or Hardware Insert assignment:
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Right-click the assignment selector and choose Show Assignments To for the bus you want. Any hidden tracks with the corresponding assignment are shown.
To show only tracks based on the track Input or Output assignment, Send assignment, or Hardware Insert assignment:
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Right-click the assignment selector and choose Show Only Assignments To for the bus you want. All other tracks are automatically hidden.
 
To restore all previously shown tracks:
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Right-click any assignment selector and choose Restore Previously Shown Tracks.