Yamaha DX7 II FD Supplemental Booklet page 19

Edit Recall Function
While in any of the Play modes (Single, Dual, Split or Performance), you may wish to
restore a voice you had been editing but hadn't yet saved. You may recall the last edited
Voice, Performance, or Microtuning scale using the Edit Recall function.
For example, you finish editing a voice and return to the play mode. Before saving the
voice, you select several different voices and wish to compare each with the edited
version. At any time you may use the Edit Recall function to bring back the edited voice,
currently in the Edit buffer, for comparison.
Simply follow the steps below to use the Edit Recall function.
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