3 title: Undo/Redo for Editing
7 While editing, it happens that you apply an unintended change, or make
8 a choice one that you later decide was wrong. All changes to the
9 arrangement of session components (regions, control points) along the
10 timeline can be <dfn>undone</dfn> (and <dfn>redone</dfn> if necessary).
13 The default keybindings are <kbd class="mod1">Z</kbd> for Undo and
14 <kbd class="mod1">R</kbd> for Redo. These match the conventions of most
15 other applications that provide undo/redo.
18 Changes are also saved to the <dfn>session history</dfn> file, so that
19 undo/redo is possible even if you close the session and reopen it later,
20 even if you quit Ardour in between.
23 The maximum number of changes that can be undone can be configured under
24 <kbd class="menu">Edit > Preferences > Misc > Undo</kbd>.
25 The maximum number of changes stored in the history file is a separate
26 parameter, and can also be set in the same place.
30 In addition to the normal undo (which works only on actions that change
31 the timeline), there is a <dfn>visual undo</dfn> which will revert any
32 command that affects the display of the editor window. Its shortcut is
33 <kbd class="mod3">Z</kbd>.
34 There is also an undo for selection. See
35 <a href="/ardours-interface/basic-gui-operations/selection-techniques/">Selection Techniques</a> for more information.