Yamaha S90 ES Owner's Manual page 114

Internal Structure (System Overview)
Amplitude
[VOICE] Voice selection
This unit controls the output level (amplitude) of the sound output from Filter. The signals are then sent at this level to the Effect
block. Also, by setting the AEG (Amplitude Envelope Generator), you can control how the volume changes over time.
AEG (Amplitude Envelope Generator)
Using the AEG, you can control the transition in volume from
the moment the sound starts is to the moment the sound
stops. You can create the AEG by setting parameters as
illustrated below. When you press a note on the keyboard,
the volume will change according to these envelope
settings. Furthermore, different AEG parameters can be set
for each Element or each Key.
When using a Footswitch connected to the FOOT SWITCH (SUSTAIN) jack
When the Half Damper function is set to off
When you release the key while holding the Footswitch, the sound will stay at the Sustain Level (Decay 2 Level) shown.
(For Voices having a Sustain Level of 0, the sound decays naturally to silence.)
When releasing the Footswitch, the operation is same as key off; the sound will start to decay, and finally decay to
silence according to the Release Time.
When the Half Damper function is set to on (FC3 only)
When you release the key while pressing the Footswitch fully down, the sound will decay to the Sustain Level (Decay 2
Level), according to the Sustain Time value.
In this case, you can control the decay time between the Sustain Time and Release Time by how far down you press
the pedal. However, when you release the pedal after releasing the keys (key off event), the sound will decay according
to the Release Time, as if the Half Damper function was set to off.
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For details about the Footswitch and how to turn the Half Damper function on or off, see page 60.
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When releasing the key before the sound reaches the Sustain Level
When pressing the Footswitch fully down, the sound will decay after reaching the Sustain Level (after the Decay 2 Time). When the Footswitch is
not pressed fully down, the sound will decay immediately.
LFO (Low Frequency Oscillator)
[VOICE] Voice selection
[VOICE] Voice selection
As its name suggests, the LFO produces a wave of a low frequency.
These waves can be used to vary the pitch, filter or amplitude of each Element to create effects such as vibrato, wah and
tremolo. LFO can be set independently for each Element; it can also be set globally for all Elements.
114
Owner's Manual
[EDIT] Element selection/Drum Key selection
Attack
Level Level
(Volume)
Decay 1
Level
Attack Decay1 Decay2
Time Time Time
Pressing the key (Key on)
Pressing the pedal
[EDIT] Element selection/Drum Key selection
[EDIT] [COMMON] [F5] LFO
[F4] AMP
Attack
Level
Level
(Volume)
Initial
Level
0
Decay1
Attack
Time
Time
Pressing the key (Key on)
Half Damper
function is
set to off
Half Damper
function is
Sustain Level
set to on
(Decay 2 Level)
Sustain Release
TIme Time
Releasing the key (Key off)
Releasing the pedal
[F5] LFO
Decay1
Level
Sustain Level
(Decay2 Level)
Decay2 Release
Time Time
Releasing the key (Key off)
Time
Release
Level
Time