Phil,
Let’s see if this help’s out:
Undoing and Redoing Edit Operations
Ctrl+Z
Edit Menu
Ctrl+Y
Undo and redo give you the freedom to experiment with your project. Edit to your heart’s content. If you change your mind, you can always undo your changes. If you change your mind again, you can redo the undone edits (whew!).
For example, if you accidentally deleted a track, simply choose Undo to restore the track.
You can perform an unlimited number of undos, so you can restore the project to any state since the last Save command.
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What do you want to do?
Undo the last action performed
From the Edit menu, choose Undo or click the Undo button .
Undo a series of actions
Click the arrow next to Undo button . A list of the most recent actions that you can undo is displayed.
Select the action you want to undo. If the action does not appear in the list, use the scroll bar to scroll through the list. The selected action and all actions above it are reversed.
Reverse the last Undo performed
From the File menu, choose Redo, or click the Redo button .
If you later decide that you did not want to reverse an undo, click the Undo button .
Reverse a series of Undo actions
When you reverse an Undo, you also reverse all Undo actions above it in the list.
Click the arrow next to Redo button . A list of the most recent actions that you can redo is displayed.
Select the action you want to redo. If the action does not appear in the list, use the scroll bar to scroll through the list. The selected action and all actions above it are redone.
Undo all edits
From the Edit menu, choose Undo All to reverse all edits in the undo history.
You can view the edit history by clicking the arrow next to Undo button .
Clear the edit history
From the Edit menu, choose Clear Edit History to clear all of the entries in the Undo/Redo History list for the current project.
The edit history is also cleared when you close your project.
You will not be able undo or redo any previous changes after clearing the history. Don’t forget the (History) left and right arrows in the tool bar.
I hope this helps,
Ralph Hajik