This is host-dependent.  While some host applications support the following keyboard command equivalents for the Edit Buttons, others reserve these commands for their own use and therefore do not pass them on to Auto-Tune. Consult your host application’s manual for details (or just try them and see if they work).

Function     Keyboard Equivalent(s)
UNDO       Command/Control-Z
CUT         Command/Control-X/Delete
COPY        Command/Control-C
PASTE       Command/Control-V
SELECT ALL   Command/Control-A