History - Undo and Redo
- Undo/Redo is fast, irrespective of how long the original action took. Use it to listen easily to "before" and "after" versions of your work.
- As you apply more actions, the disk space needed to allow Undo/Redo of those actions grows.
- The Undo/Redo space usage is discarded on closing the project.
- Undo/Redo steps for an open project can be managed in the History window.
- Saving or exporting
- Changing the track height or the selection or cursor position (these are saved when you save a change that is recorded by Undo/Redo)
- Changing preferences settings.
The History dialog lets you view and manage all of the actions you have taken since you opened a project.
Accessed bythe History dialog window can be resized by clicking and dragging on its borders.
- History dialog at larger non-default size
The History list has two columns:
- "Action" shows a list of all project states that you can go back or forward to, earliest state first.
- "Used Space" shows for each action in the list the amount of disk space that that action used.
- Total space used: Displays the total disk space currently used by the project, which is the total of all the "Used Space" values shown in the History list.
- Clipboard space used: This indicates the amount of disk space currently used by the Audacity Clipboard.
- button: Accepts the changes made in the History window, if any, and closes the window.
- help button, brings you to the appropriate page in the Manual, this page.
Rolling back/forward - multiple Undos/Redos
Select an item in the History list, and click thebutton, to Undo or Redo immediately to that action.
It is the same as choosingor multiple times, but much quicker.
- The actions show grayed out will become Undone and the non-grayed out actions will remain.
- The displayed waveforms will change with the selection to show the effect of the change.
- The grayed-out items will remain available for a potential Redo until you perform a new action on the project.
Undo and Redo
There are four ways to Undo or Redo.
- The Undo and Redo choices at the top of Edit Menu
- Two buttons in the Edit Toolbar: Undo and Redo
- Select "History..." from the View Menu and click on an action to jump the project state to there
- Use the Keyboard shortcuts:
Windows Linux Mac Undo Ctrl+Z Ctrl+Z ⌘+Z Redo Ctrl+Y Ctrl+Shift+Z ⌘+Shift+Z
Undo is unlimited, back to the first action you took in the project, since the project was opened. That means you can make a hundred changes, then change your mind and undo them all.
Undo History is stored for each project, while that project remains open. So saving a project does not erase your Undo History, but closing a project does erase it. When you reopen a saved project, it starts with an empty History.
|Undo is stepwise. This means that if you Undo to several steps back then perform a new action, you cannot then redo the old steps that followed the point you went back to. For example, suppose you made ten edits, numbered 1 through 10. Now you undo back to step 5, and then perform a new edit, which we will call 6b because it is different from the original 6. At this point you can undo back to step 5 or all the way back to 1, but you can no longer get back to the original steps 6 through 10, which will be removed from the project History.|
Undoing actions using the History dialog will eventually free up disk space, but only after you make further actions on the project as the complete undo/redo history is retained until then.
|You can, if you wish, compress your project removing the temporary storage with:
But note carefully that this will remove your Undo History and delete the contents of your Audacity clipboard.