Undo All

Edit Menu

From the Edit menu, choose Undo All to undo all operations performed on a file. Unless the Disable Undo/Redo command was used after you opened the file, Undo All will return your file to its original state.

When not working in Direct mode, you can simply close the file without saving changes to revert to the original file. However, when working in Direct mode, Sound Forge performs an Undo All operation automatically before saving if you decide not to save the current changes.