Yamaha A3000 Owner's Manual page 193

AttackMode
Knob 4
This value sets the AEG attack mode — the way that amplitude behaves immediately
following Note On.
rate
hold
Note that the AtkRate setting on the AEG page ( 188) sets the timing for the attack.
Higher AtkRate settings produce a faster attack — so that the level rises more quickly (if
the mode is set to rate) or holds steady for a shorter time before dropping (if the mode is
set to hold).
If AttackMode = rate:
Maximum Level
= rate, hold
Level starts at 0 (when Note On occurs) and rises to maximum,
then begins to drop.
Level starts immediately at it maximum point and holds steady
for a certain interval before beginning to drop.
Level
Attack Rate
Note On Note Off
EG Function
If AttackMode = hold:
Level
Maximum Level
Time
Attack Rate
Note On
Chapter 5
Time
Note Off
EDIT Mode
191