Yamaha SY77 Operating Manual page 136

VOICE EDIT MODE
Press F3 (Rate) to set EG rates. Press F4 (Lvl)
to set EG levels.
To change the range of the EG graphic display,
hold SHIFT and press F1-F6 (x1, x2, x5, x10, x20,
x50).
To shift the EG graphic display to a different
segment, hold SHIFT and press F7 or F8.
HT (Keyon Delay Time 63...0): When this is set
to 0, the operator EG will begin immediately
after a key is pressed. For higher settings, there
will be an increasingly longer delay before the
operator EG begins.
R1-R4, RR1-RR2 (Keyon Rates, Release Rates
0...63): Keyon Rates 1—4 and Release Rates 1-
2 determine the speed of the operator EG.
Higher settings result in faster change.
RS (Rate Scaling -7...+7): Rate Scaling allows
the operator EG rates to be increased or de-
creased depending on the key that is played. For
positive settings the EG rates will increase as
you play higher notes, resulting in shorter
envelopes. For negative settings the EG rates
will decrease as you play higher notes, resulting
in longer envelopes.
L0-L4, RL1-2 (Keyon Levels, Release Levels
0...63): Keyon Levels 0-4 and Release Levels
1-2 determine the levels of the operator EG.
SLP (Segment Loop Point S1...S4): This
specifies the segment from which the EG will
continue looping if a key remains depressed after
the EG has arrived at level L4.
Rates and Levels: When you press a key, the
operator output will be at the level of L0. When
the specified hold time (HT) has elapsed, the
level will change at the rate of R1 to level L1.
When the level reaches L1, it will change at the
rate of R2 to the level of L2. When the level
reaches L2, it will change at the rate of R3 to the
level of L3. When the level reaches L3, it will
change at the rate of R4 to the level of L4. When
the level reaches L4, the EG will begin looping
from the specified segment.
When you release the key, the level will
change at the rate of RR1 to the level of RL1.
When the level reaches L5, it will change at the
rate of RR2 to the level of RL2.
Remember that Hold Time (HT) is a time
setting, but the various Rates are speed set-
tings. Higher settings for Hold Time will result
in a longer delay before the operator EG begins,
124
but higher settings for Rates will result in faster
change.
Segment Loop Point: The SLP setting determines
the Level from which the EG will loop. If you
continue holding a note after Level 4 is reached,
when SLP is set to
SLP=S1 the level will change L4
L4 L1
L3
SLP=S2 the level will change L4
L4 L2
SLP=S3 the level will change L4
L3
SLP=S4 the level will remain at L4
The following diagram shows how EG levels would
change when SLP=S3
Rate Scaling: On most acoustic instruments, high
notes have a naturally shorter attack and decay.
This can be simulated by setting rate scaling to
a positive value (+1...+7). The following dia-
gram shows how higher notes will have faster
rates (shorter EGs). Negative settings will
have the opposite effect.
L2
L1
L2 L3
L3 L4