Yamaha S90 Owner's Manual page 56

Control Sets and External MIDI Control
In a Control Set, the controllers are assigned to the
internal parameters of the synthesizer. However,
some controllers were originally designed for a
particular purpose, and send pre-defined MIDI
Control Change messages when used, regardless of
their Control Set allocations within the synthesizer.
For example, the Pitch Bend Wheel, Modulation
Wheel and keyboard aftertouch were originally
designed to control pitch bend, modulation and
aftertouch. Therefore, when you use these
controllers, pitch bend, modulation and aftertouch
information is always sent to the MIDI Out.
Let's say the Pan parameter is assigned to the Pitch
Bend Wheel in a Control Set. Now, when you move
the Pitch Bend Wheel, the internal tone generator of
the synthesizer will pan the sound; however, at the
same time, the original pre-defined Pitch Bend
messages will still be sent to the MIDI Out.
\
MIDI
Pitch Bend
Wheel
Tone Generator
Pitch LFO1
The controllers can also send MIDI Control Change
messages to control the parameters of external MIDI
devices. These assignments can be set in the Utility
Mode.
n Since Pitch Bend Wheel, Modulation Wheel and
keyboard aftertouch are pre-defined with specific
MIDI controls, other MIDI Control Change
numbers cannot be assigned to them.
You can also set up a controller such that it sends
one kind of Control message to the synthesizer's
internal tone generator yet another kind to the MIDI
Out.
For example, in a Control Set you could assign
resonance to Assignable 1 Slider. Then, in the
Utility Mode, you could assign Control Number 1
(Modulation) to the same controller. Now, when
you use the controller, resonance will be applied to
the sound of the internal tone generator; however, at
the same time, modulation information will be sent
to the external MIDI device connected to the MIDI
Out.
56
Using Controllers
OUT IN
MIDI Control
Controller Set
PAN
Primary control number and function
MW/AC1/FC (Variable control)
7 Volume
10 Pan
11 Expression
71 Harmonic Contents (Resonance)
72 Release Time
73 Attack Time
74 Brightness
75 Decay Time
91 Reverb Send Level
93 Chorus Send Level
FS (on/off switch)
64 Hold 1 (Sustain)
65 Portamento Switch
66 Sostenuto
96 Arpeggio Switch
97 Arpeggio Hold
98 PLAY/STOP
99 Program Change INC
100 Program Change DEC
101 Octave Reset
See page 119