KORG Electronic Keyboard - Manual (Page 89)

Program P4: Amp/EQ 4–3: Amp1 EG
79
Time
Higher values mean longer times, as shown below.
Attack [00…99]
This sets how long the EG takes to move from the Start
level to the Attack level.
The minimum attack time is 2/3 of a millisecond–as
fast as the most punchy of classic analog synths.
For the fastest possible attack time, you can set the
Start level to +99; in this case, the EG will start
instantaneously at its maximum value.
Decay [00…99]
This sets the time it takes to move from the Attack level
to the Break level.
Slope [00…99]
This sets how long the EG takes to move from the
Break level to the Sustain level. Once it reaches the
Sustain level, the EG will stay there until note-off
(unless it is reset via AMS).
Release [00…99]
This sets how long it takes the EG to move from the
Sustain level to silence.
Curve
For the sake of simplicity, most of the diagrams in this
manual show envelopes as being made out of straight
lines. In actuality, though, envelopes are more likely to
be made out of curves.
In other words, each segment’s level will change
quickly at first, and then slow down as it approaches
the next point. This tends to sound better than straight,
linear segments.
Classic analog synth envelopes made these curved
shapes naturally. The OASYS goes a step further than
vintage synths, however, and lets you control the
amount of curvature separately for each of the four
envelope segments.
When you change the curvature, the EG times remain
the same. However, greater curvature will tend to
sound faster, because the value changes more quickly at
the beginning.
Amp EG Curve
Different curve settings for up and down
You may find that different amounts of curvature are
suitable for segments which go up and segments
which go down.
For instance, a curve of 3 is a good default setting for
upward segments, such as Attack. On the other hand, a
curve of 6 or more is good for downward segments,
such as Decay and Release.
Attack [0 (Linear), 1…9, 10 (Exp/Log)]
This sets the curvature of the Attack segment - the
transition from the Start level to the Attack level.
Decay [0 (Linear), 1…9, 10 (Exp/Log)]
This sets the curvature of the Decay segment - the
transition from the Attack level to the Break level.
Slope [0 (Linear), 1…9, 10 (Exp/Log)]
This sets the curvature of the Slope segment - the
transition from the Break level to the Sustain level.
Release [0 (Linear), 1…9, 10 (Exp/Log)]
This sets the curvature of the Release segment - the
transition from the Sustain level to the Release level.
4–3c: Level Modulation
These settings let you use any AMS source to control
the Level parameters of the EG. The Start, Attack, and
Break levels share a single AMS source, but can each
have different modulation intensities.
By using different settings for each of the three levels,
you can cause both subtle and dramatic changes to the
EG shape, as shown below.
Amp EG Level Modulation
EG Value Actual Time
00 0.667 ms
10 10 ms
20 44 ms
30 104 ms
40 224 ms
50 464 ms
60 944 ms
70 1.8 seconds
80 3.8 seconds
90 10.9 seconds
99 87.3 seconds
Curve = 0 (Linear)
Curve = 0 (Linear)
Curve = 10 (Exp/Log)
Curve = 10 (Exp/Log)
Original Shape
Positive AMS on Start and Break,
Negative AMS on Attack
Negative AMS on Start,
Attack, and Break
Volume
Time
Volume
Time
Volume
Time
Volume
Time
Positive AMS on Start,
Attack, and Break