Reference Guide

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Undo, redo, and the undo history
Arranging and editing
The History list is updated every time you make a change to a project. For example, if you insert a
new note into a project using the Piano Roll view, that action is added to the History list. This entry
remains on the list—even if you undo the change—so that you can redo the change later on. If you
delete the note, this change is added to the History list.
You can click the Clear button in the Undo History dialog box to erase the undo history for the
current project and free up some memory. If SONAR is low on memory, it may offer to erase the
History list. To revert to an earlier version of a project, highlight the entry in the History list that
represents the point to which you’d like to return, and click OK. SONAR performs the necessary
undo or redo actions to take you to that point. Once you edit the project (for example, by inserting a
note), the History list is truncated at that point. Then, as you do further work, the History list grows
again. Any events occurring before the event you highlighted remain on the list.
By default, SONAR keeps a history of up to 128 editing actions for each open project. Once that limit
is reached, each new action pushes out the oldest item from the History list. You can raise or lower
that number in the Undo History dialog box.