Yamaha SY99 Owner's Manual page 82

Use zoned aftertouch
Other controller
assignments
With the settings as shown in the display, the PITCH wheel will bend the pitch
up or down by two half steps. Modify the Pitch Bend Wheel value in the display,
and move the PITCH wheel up and down to hear how the pitch is affected.
Note: The action of the PITCH wheel may be modified using the Zoned Aftertouch
settings, described below. This allows for rather sophisticated usage of the
PITCH wheel.
The keyboard of the SY99 is sensitive to aftertouch (pressure on the keyboard
after a note is played). A single aftertouch value is produced for the entire key-
board; not independently for each note. However, the SY99's Zoned Aftertouch
parameter allows you to restrict the effect of aftertouch to a specified zone
(area) of the keyboard, or even to the single highest or lowest note currently
being pressed.
Press P2 (Aftr) to get a display like the following.
As shown in the display, set Zoned After Touch Mode to "top", and After
Touch Pitch Bend Range to "+2". Now play and hold a chord, and press firmly
down on the keyboard. Notice that only the top note of the chord rises in pitch.
In this example, aftertouch is affecting the pitch bend. However just as you
assigned vibrato to be affected by the MODULATION 1 wheel, you can also assign
vibrato (or any other parameter) to be affected by aftertouch. In this case, zoned
aftertouch would allow you to apply vibrato to just the top note of a chord when
you press down on the keyboard. Since the melody line is usually the highest in
pitch, zoned aftertouch can be used to make the melody stand out expressively
from the other notes being played.
Other settings of Zoned After Touch Mode allow aftertouch to affect all
notes, the bottom note, notes above a split point, or notes below a split point.
F4 (Pan) allows you to make assign controllers to regulate panning (stereo
position), and F5 (Othr) allows you to make controller assignments for various
other parameters.
Except for pitch bend, a different controller can be assigned to each
parameter. It is also possible to assign the same controller to affect two or more
parameters.
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