Doepfer A-141 VC-ADSR (VC Envelope Generator) - Manual (Page 5)

doepfer System A - 100 VCADSR A-141
5
5. User examples
Basically, the envelope generated by the VCADSR
can be used for any number of types of modulation:
• VCADSR - VCA
Complex amplitude changes over time
• VCADSR - VCA for voltage control
Time-dependent control of all sorts of modulation
voltages to and from other modules
• VCADSR - VCF
Modulation of the filter cut-off frequency for con-
stantly evolving sound spectra
• VCADSR - VCO (PWM)
Time control of Pulse Width Modulation changes
for evolving timbres
• VCADSR - VCO (FM)
Pitch modulation as notes progress (and timbral
change with very short envelope settings).
Look in the individual manuals for further examples
and notes.
The VCADSR in a MIDI system
In contrast with the A-140 standard ADSR, the A-141’s
parameters can be voltage controlled. One particular
possibility is to control the changes in parameters with
a MIDI sequencer and MIDI-CV interface (for in-
stance, the A-191) by simply sending MIDI controller
messages.
That actually makes the ADSR parameters program-
mable, and also means that you can change them as
you play, in real time (for instance by using velocity to
control the Decay parameter).
Using the VCADSR with a sequencer
Used in conjunction with a sequencer like the MAQ
16/3, you can get some interesting results - for in-
stance programming a different VCF or VCA decay
time for each note in a sequence. You simply
connect the second CV output of the MAQ 16/3 to
input " (CV D) on the A-141 which is patched into the
VCF or VCA.
Controlling the release time
A common VCADSR application is shown in the patch
in Fig. 3, where the higher the note played, the shor-
ter the release time. This mimics the natural beha-
viour of most acoustic instruments.
The A-175 Voltage Inverter simply inverts the pitch CV
and sends it to the release CV input $ (CV R). You
control the intensity of this effect with control 8.