Yamaha SY99 Owner's Manual page 251

PATTERN MODE
Tie (numeric key "-"): To extend the duration
of the previously entered note, press TIE. The
duration of the note will be extended by the
current note value, and the cursor will advance
accordingly.
Rest (numeric key 0): To advance one step
without entering data press REST.
Recording procedure:
Entering notes: Each time you press and re-
lease a key it will be recorded, and the posi-
tion will move ahead one step as specified by
the step time. The note will not be entered
until all keys have been released. This allows
you to enter more than one note at the same
location by pressing more than one note
before releasing the first.
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Move through the data: When the cursor is
located at you can also use the cursor keys
to move back and forth in the pattern, and
enter notes wherever you like. When you
come to note data, it will be displayed on the
keyboard diagram below and sounded on the
synthesizer.
To stop recording: When you are finished
recording the pattern press STOP. You will re-
turn to the pattern play display, where you can
press RUN and hear the pattern you just
recorded.