Yamaha PSR-S770 Reference Manual page 48

Filter Resonance
EG Attack
EG Decay 1
EG Decay 2
7-3
Press the [EXIT] button to close the window.
8
Press the [EXIT] button to return to close the DRUM SETUP window.
2
NOTICE
The edited Style will be lost if you change to another Style or turn off the power to the instrument without carrying out the Save operation
(step 7 on
48
PSR-S970/S770 Reference Manual
Determines the emphasis given to the cutoff frequency (resonance), set in Filter
Cutoff above. Higher values result in a more pronounced effect.
Determines how quickly the sound reaches its maximum level after the key is
played. The higher the value, the quicker the attack.
Determines how quickly the sound reaches its sustain level (a slightly lower level
than maximum). The higher the value, the quicker the decay.
Determines how quickly the sound decays to silence after the key is released. The
higher the value, the quicker the decay.
page 31).