Yamaha PSR-S750 Reference Manual page 16

EG
The EG (Envelope Generator) settings determine how the level of the
sound changes in time. This lets you reproduce many sound
characteristics of natural acoustic instruments—such as the quick
attack and decay of percussion sounds, or the long release of a
sustained piano tone.
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VIBRATO
Vibrato is a quavering, vibrating sound effect that is produced by
regularly modulating the pitch of the Voice.
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EFFECT/EQ Page
1 REVERB DEPTH/CHORUS DEPTH/DSP DEPTH/PANEL SUSTAIN
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16
PSR-S950/S750 Reference Manual
] ATTACK Determines how quickly the sound reaches its maximum level after the
key is played. The lower the value, the quicker the attack.
] DECAY Determines how quickly the sound reaches its sustain level (a slightly
lower level than maximum). The lower the value, the quicker the decay.
] RELES. Determines how quickly the sound decays to silence after the key is
(Release) released. The lower the value, the quicker the decay.
] DEPTH Determines the intensity of the Vibrato effect. Higher settings result in a
more pronounced Vibrato.
] SPEED Determines the speed of the Vibrato effect.
] DELAY Determines the amount of time that elapses between the playing of a key
and the start of the Vibrato effect. Higher settings increase the delay of the
Vibrato onset.
]/ REVERB Adjusts the reverb depth.
] DEPTH
]/ CHORUS Adjusts the chorus depth.
] DEPTH
] DSP ON/OFF Determines whether the DSP effect is on or off.
This setting can also be made from the VOICE CONTROL [DSP] button
on the panel.
] DSP DEPTH Adjusts the DSP depth.
If you want to re-select the DSP type, you can do so in the "2 DSP" menu
explained on
] PANEL SUS- Determines the sustain level applied to the edited Voice when the VOICE
TAIN CONTROL [SUSTAIN] button on the panel is turned on.
Key on
page 17.
Level
Sustain
Level
ATTACK DECAY RELEASE
Key off
Pitch
SPEED
DEPTH
DELAY
Time
Time