GEM RP220 Owner's Manual page 74

The piece recalled using the I.M.S.
if the sequence of notes is correct. If you make a mistake, the
computer will search until it finds a piece corresponding to the notes
played, or it will notify a failure with the message "NOT FOUND".
In this case the empty staff is shown again in order that you may
repeat the operation.
Note: You'll find a list of Songs contained in the Song Library in
Section 7 "Reference".
70
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method will be recognized only