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Editing Digital Audio in Pro Tools

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The Scrubber Tool

The purpose of the Scrubber in Pro Tools is to emulate the “scrubbing” technique used to edit analog tape. By scrubbing over a digital audio edit point, you can listen in closely to find the exact edit point, which may not be obvious just by looking at the waveform.

To scrub an audio track, select the Scrubber and drag within a track. To scrub two adjacent audio tracks at once, simply drag along the line between the two tracks. Zoom in on a track to scrub over a small area, or press Command (Mac) or Control (Win) to scrub at a finer resolution without zooming.

The direction, distance, and speed at which you drag will determine the sound of the scrubbed audio. Normal scrubbing allows you to scrub at regular playback speed or slower. If you want to scrub at speeds faster than regular speed, press Option (Mac) or Alt (Win) while dragging. This is called Scrub/Shuttle mode and allows for scrubbing at several times the regular speed. This feature is useful for scrolling through long tracks to find a specific part of the track.

The Pencil Tool


Fig. 4.5. Click on the Pencil tool to choose between the five Pencil
drawing shapes.

When editing audio, the Pencil tool has one function: to redraw waveforms. Often, this is done to repair waveforms, such as to eliminate a pop or click on the track. However, the Pencil has many other useful functions, including inserting MIDI notes, editing velocities for a range of MIDI notes, and drawing automation and controller events. And by pressing Option (Mac) or Alt (Win), the Pencil tool turns into an Eraser, which can be used to delete MIDI notes, or to program changes and sysex events. (Editing MIDI data is covered in chapter 5.)

As you may have already noticed, the Pencil tool comes in five flavors: Free Hand, Line, Triangle, Square, and Random.

These represent the different shapes you can draw with the Pencil. I use the free hand and line shapes most often when editing audio. The other shapes are more useful when drawing or editing automation and MIDI data.

Note! The Pencil is a destructive tool. It actually changes the original audio file permanently! Although pencil edits can be undone, be careful how you wield your pencil . . . it can be sharper than a sword when used on audio files.


The Zoomer Tool

Primarily, the Zoomer tool helps you to enlarge a track (as you would with a magnifying glass or microscope) and find details within its waveforms. It’s good for exposing problem areas in a track or locating good edit points.


Fig. 4.6. The Single Zoom tool is identified with an arrow to the right of the Zoomer tool icon. Normal Zoom mode doesn’t have the arrow.

To zoom in one level and center the Edit window at the zoom point, click once on a region with the Zoomer tool. To zoom back out to the previous level, Option + click (Mac) or Alt + click (Win) with the Zoomer; in this case, a negative sign “-” appears inside the Zoomer tool instead of the usual plus sign “+”. Often, a more useful way to zoom is to click and drag on the specific part of a track that you want to magnify horizontally. In this instance, the zoomed area fills the entire edit window.

In addition to the normal Zoomer tool, you can select the Single Zoom tool that returns you to the previously selected tool after a zoom has been performed. For example, when using the Selector you can click on the Single Zoom Tool mode and, once the Zoom operation has been performed, Pro Tools automatically switches back to the Selector.

KEYBOARD SHORTCUTS FOR THE EDITING TOOLS
You can use the function keys to switch between the edit tools. Simply press:

• F5 for the Zoomer (keep pressing F5 to toggle between the two Zoomer tools)
• F6 for the Trimmer (keep pressing F6 to toggle between the two Zoomer tools)
• F7 for the Selector
• F8 for the Grabber (keep pressing F8 to toggle between the two Grabber tools)
• F9 for the Scrubber
• F10 for the Pencil (keep pressing F10 to toggle through the five Pencil shapes)
• F6 + F7 for the Smart Tool

A PDF document listing all of the keyboard shortcuts was installed on your computer with Pro Tools. Print out this document (appropriately named “Keyboard Shortcuts.pdf”) and become familiar with the shortcuts . . . they will improve your Pro Tools efficiency immensely.

Tab to Transients and Link Selections


Fig. 4.7. Tab to Transients is particularly useful for editing drums or other percussive instruments, where the transients are usually indicative of the beginning of a beat, measure, or phrase.

In the same area of the Edit window as the Edit modes, there are two other useful buttons. Tab to Transients allows you to use the Tab key to navigate from one transient part of an audio waveform to the next.

The other useful button found to the right of the Tab to Transient button in figure 4.7 is the Link Selections button. This button links Edit and Timeline selections, allowing you to set play and record ranges by selecting in the track’s playlist. When unlinked (the button is unhighlighted), you can make Edit selections without disturbing the Timeline selection. What that means is that you can select a portion of the session to play in the Timeline (conductor ruler), but edit a different section of the session. I usually just keep the Link Selections button highlighted, but occasionally it’s useful to unlink the Edit and Timeline selections. For instance, when unlinked, you can loop a MIDI drum beat and edit a few of the notes within the loop while it’s playing back without interrupting the playback.

Track Views
Pro Tools offers many options for viewing your regions and tracks. As seen in figure 4.8, the Track View Selector, found in the Edit window below each track’s name, allows you to choose which data is displayed in the track’s playlist. Whatever data you choose to display is the data that you can edit on-screen.


Fig. 4.8. The Track View Selector for (a) an Audio Track, (b) a MIDI Track, (c) an Aux Track, (d) a Master Fader Track.

Audio and MIDI tracks have “Master views.” That is, when a track is viewed in its master format, any edits performed on that track apply to all data on that track. For example, when an audio track is set to Waveform view, deleting part of the waveform data will also delete automation data on that section of the audio track. Here are the Master Views for each type of track.

For most of your audio and automation editing, you’ll probably use the Waveform and Volume views. To easily toggle back and forth between these two views, click in a track that you want to toggle (Shiftclick for additional tracks), and press Ctrl + - (Mac) or Start + - (Win) on the alpha keyboard.

 

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