Sony BZDM-7020 User Manual page 255

Undelete function
Undo function
Until you delete another key frame, you can always recover the
last deleted key frame, which is saved in an undelete buffer. You
can reinsert this key frame at any position, using the following
procedure.
1
Stop the effect on the required edit point. Regardless of the
position from which the key frame was deleted, you can
reinsert it at any position. When the edit point is on a key
frame, the following procedure inserts the previously deleted
key frame immediately before the edit point.
2
Press the KF EDIT ENABL button, turning it on.
3
Hold down the SHIFT button and press the UNDEL/UNDO
button.
This reinserts the key frame from the undelete buffer.
To undo the effect of the last operation, and return to the state
before the edit, press the UNDEL/UNDO button.
This applies to operations with the BEFR/INSRT, DEL, MOD,
and KF/DUR EFF buttons.
Chapter 7 Key Frame Effects
7-15