Doepfer A-141 VC-ADSR (VC Envelope Generator) - Manual (Page 3)

doepfer System A - 100 VCADSR A-141
3
3. Controls and indicators
As soon as a gate signal is sensed at the VCADSR
gate input 5, the VCADSR puts out a varying voltage,
changing in time, known as an envelope. See Fig. 1.
Fig. 1: ADSR envelope and its parameters
The parameters A, D, S and R can be adjusted by
hand with controls 1 to 4, or can be controlled by the
voltages patched into CV inputs ! to $. These control
voltages and the voltages set by hand are summed.
1 A
This controls the Attack time of the envelope.
Whenever the VCADSR is triggered - by a key being
pressed on your controller keyboard, or by an external
gate being sensed at the gate input 5 - the control
voltage at output 7 rises to the maximum, in a time
determined by the setting of this knob, and any voltage
patched into its Attack CV input.
2 D
This controls the Decay time of the envelope. After
the attack phase is finished, the voltage falls to the
level set by the sustain knob and CV, in a time
determined by the setting of this knob, and its CV
input.
3 S
This controls the Sustain level of the envelope. After
the decay phase, the voltage stays at this level until
the gate is released.
4 R
This controls the Release time. As soon as the gate
signal finishes, for instance when the key on the
controller keyboard is released (Note Off in MIDI), the
voltage at the output falls to its minimum, in a time
determined by this knob and the Release CV.
Sustain
Level
Attack
Time
Decay
Time
Release
Time
+3 ... +12 V
0 V
On Off
Time ➨
ca. +8 V