AAS ULTRA ANALOG VA-3, Руководство пользователя

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50 The Editor View
Figure 29: Response curve of an envelope generator. Broken line: exponential, full line: linear.
The envelope modules generate a four segment envelope: attack,
decay, sustain, release. The attack time is adjusted using the Attack
knob. The attack time can also be modulated with the velocity signal
received from the MIDI keyboard to make the attack time shorter as the
velocity increases, the intensity of this effect being controlled using the
Vel knob on the left of the Attack knob. When this knob is in its leftmost
position, the attack is only determined by the value of the Attack knob,
turning the knob clockwise increases the influence of the velocity signal
until the attack time is strictly determined by the inverse of the velocity
signal when the
Vel knob is fully turned to the right. The decay time is
set with the Decay knob. The sustain phase of the envelope generator
lasts from the end of the decay phase until the key is released. When
the
Sustain knob is fully turned to the left, the sustain level is zero and
there is no sustain phase while fully turned to the right, the sustain level
is at maximum and there is no decay phase. When the key is released,
the envelope generator toggles to the release phase and the envelope
signal decreases from the value at the end of the sustain phase to zero
in a time set by the
Release knob.
Note that during the sustain phase, the envelope signal can be made
to decrease even if a key is still depressed. The time taken to go from the level set by the Sustain
knob to a value of zero is then determined by the value of the Time knob located below the Sustain
knob. When the Time knob is fully turned to the left, the envelope signal falls to zero right after
the end of the decay phase; when the knob is in it rightmost position, the sustain level is held as
long as the key is depressed. Finally, the overall level of the envelope can be controlled with the
velocity signal from the keyboard through the
Vel slider located to the left of the Sustain knob and