Yamaha QY100 Owner's Manual page 141

EG (Envelope Generator) Controls
The envelope generator controls affect the level "enve-
lope" of the sound — i.e. its attack, decay, and release times.
Plotted against time, the level envelope looks something like this.
Attack
A (Attack Time)
Adjusts the attack portion of the envelope generator curve
from "-64" through "0" to "+63". Negative values produce a
faster attack while positive values produce a slower attack.
The graphic envelope generator curve will shift to indicate the
current setting (the heavy default setting curve will also remain
on the display).
D (Decay Time)
Adjusts the decay portion of the envelope generator curve
from "-64" through "0" to "+63". Negative values produce a
faster decay while positive values produce a slower decay.
The graphic envelope generator curve will shift to indicate the
current setting (the heavy default setting curve will also remain
on the display).
R (Release Time)
Adjusts the release portion of the envelope generator curve
from "-64" through "0" to "+63". Negative values produce a
faster release while positive values produce a slower release.
The graphic envelope generator curve will shift to indicate the
current setting (the heavy default setting curve will also remain
on the display).
The Song Voice Mode
Decay
Release
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