Yamaha MU90R Owner's Manual page 62

2 ) Long Attack, Decay, Release times:
Level
Attack
Max.
Min.
Key is pressed
Even though the key is held for the same length of time in both examples,
the sound of the second example slowly reaches full volume and decays
over a longer time. It also sustains longer after the key is released.
Keep in mind that the EG parameters affect each other, and are af-
fected by how long a note is held. For example, if Decay is set to a
low value and the note is held for a long time, you may not be able
to hear changes made to the Release parameter.
EG Attack Time
Selected Part and MIDI channel
This determines the Attack Time of the EG, or how long it takes for
the sound to reach full volume when a note is played. For the Filter,
this determines how long it takes for the sound to be affected by the
maximum Filter values.
Decay
Key is released
Graphically shows EG Attack Time setting for each Part.
MULTI MODE
Release
Time
5 3