Editing : Edit Modes and Tools : Using the Scrubber Tool

Using the Scrubber Tool
For more information, see the following topics:
The Scrubber tool lets you “scrub” up to two tracks of audio in the Edit Window. Scrubbing is a technique that originated in tape editing, where the tape was rocked back and forth past the playhead at slower than normal speeds to find a particular location (usually for cutting and splicing).
While viewing an audio waveform in Pro Tools can be helpful in visually finding an edit point, sometimes a waveform display (because of its sonic characteristics) may not reveal the desired spot in the audio material. By scrubbing back and forth in Pro Tools, you can listen and locate an exact edit point.
When the Edit Insertion Follows Scrub/Shuttle option is enabled in the Operation Preferences page, the edit cursor automatically locates to the point where scrubbing stops.
When the Scrolling option is set to Continuous (Pro Tools HD and Pro Tools with Complete Production Toolkit only) or Center Playhead (Pro Tools HD only), clicking with the Scrubber in a track’s playlist centers the Edit window around that point, and moves the Playhead there. With these Scrolling Options, scrubbed material moves past the Playhead, which remains stationary and centered.
To scrub a single audio track:
1 Select the Scrubber tool.
2 Drag within the track: left for reverse or right for forward.
 
The distance and speed with which you drag (with either the mouse, or the scrub wheel on a control surface) determine the length and speed of the scrubbed audio. Audio from the scrubbed track is routed to its output, along with any effects assigned to the track.
The resolution for the Scrubber is dependent on the zoom factor for the scrubbed track.
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You can temporarily switch the Selector tool to the Scrubber tool by Start-clicking (Windows) or Control-clicking (Mac). For finer resolution, Control-Start-click (Windows) or Command-Control-click (Mac).
To scrub multiple audio tracks, do one of the following:
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– or – 
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When scrubbing multiple tracks, only the first two tracks are heard.
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The maximum number of channels scrubbed in Pro Tools is eight, which lets you scrub a 7.1 track, two stereo tracks (four channels), but not two 5.1 surround tracks (12 channels).