Specifications
Pro Tools Reference Guide220
Operations that Clear the Undo Queue
Pro Tools will not warn you of operations that
clear the Undo Queue. Operations that clear the
Undo Queue include:
• Deleting a track, or clearing a region from the
Audio or MIDI Regions List
• Selecting “Select Unused” in the MIDI Re-
gions List pop-up
• Selecting “Select Unused Regions,” or “Select
Unused Regions Except Whole Files” in the
Audio Regions List pop-up
• Importing tracks or session data
Levels of Undo and Memory
Because Pro Tools needs to keep track of the
playlists for all tracks that are edited, the use of
multiple Levels of Undo can be memory inten-
sive. You can lower the Levels of Undo in
Pro Tools to reduce the amount of system mem-
ory (RAM) used by the Undo queue. If you have
plenty of memory allocated to Pro Tools, you
can use higher Levels Of Undo.
To set the Levels of Undo in Pro Tools:
1 Choose Setups > Preferences and click the Ed-
iting tab.
2 Click in the Levels of Undo field and enter a
value of between 1–32 (Pro Tools 6.1) or 1–16
(Pro Tools 6.0 and lower).
3 Click Done to close the Preferences dialog.
The Audio and MIDI Regions
Lists
All regions that are recorded, imported, or cre-
ated by editing appear in the Audio and MIDI
Regions Lists. Regions can be dragged from ei-
ther list to tracks and arranged in any order. Re-
gions can also be auditioned from the Regions
List by Alt-clicking (Windows) or Option-click-
ing (Macintosh) them.
In the Audio Regions List, whole-file audio re-
gions are displayed in bold, and stereo and mul-
tichannel regions can be expanded to display in-
dividual channels.
Because region names can become lengthy, the
Regions List can be scrolled or resized as neces-
sary (see Figure 10). In addition, you can use the
pop-up menu at the top of either list to sort,
search, rename, and clear regions.
Levels of Undo preference
Figure 10. Audio and MIDI Regions Lists
Click to hide
Drag to resize width of
Regions Lists
Drag to resize
height of Regions
Lists
Click for pop-up menus
Key Focus