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doepfer

System A - 100

Voltage Contr. Decay / Gate

A-142

1. Introduction

Module A-142 (VCD) is a dedicated envelope gene-

rator

with just one parameter,

decay time.

This decay

time is either controlled manually or by voltage con-

trol.

Whenever a trigger arrives at the VCD's trigger input,

an envelope is generated. This can then be used to

control VCO, VCF and VCA modules, or any other

module, come to that.

In addition to this, the module produces a gate signal

of adjustable length, which can be output in inverted as

well as normal polarity.

Two

LEDs

act as indicators of the envelope and gate

signals.

A-142

Volt. Contr. Decay/Gate

Trig. In

Inverse

Gate Out

Threshold

Decay

Gate Out

Env. Out

Summary of content (8 pages)

PAGE 1
System A - 100 doepfer Voltage Contr. Decay / Gate A-142 1. Introduction A-142 Module A-142 (VCD) is a dedicated envelope generator with just one parameter, decay time. This decay time is either controlled manually or by voltage control. Volt. Contr. Decay/Gate Trig. In Decay CV Whenever a trigger arrives at the VCD's trigger input, an envelope is generated. This can then be used to control VCO, VCF and VCA modules, or any other module, come to that.
PAGE 2
A-142 Voltage Contr. Decay / Gate System A - 100 doepfer Indicators and controls: 2. Overview A-142 VCD Volt. Contr. Decay / Gate Trig. In 1 Decay : Manual control for altering the decay time. 2 CV : Attenuator for control voltages at CV input " 3 LED : Indicator for the envelope at output § 4 LED : Indicator for the gate signal at output $ Decay ➀ 10 0 CV CV ➁ 10 0 Env. Out 5 Threshold : Control to set the trigger threshold, and thus the length of gate signal output.
PAGE 3
doepfer System A - 100 3. Controls and indicators 1 Decay This is used for manual control of the decay time tD of the envelope generated. After an extremely short attack phase, the envelope runs from maximum to zero in the time that has been set by this control (see fig. 1). Voltage Contr. Decay / Gate A-142 Trig In 0V Env Out 2 CV Attenuator 2 is used to set the level of the control voltage present at CV input ", which in turn controls the length of the decay.
PAGE 4
A-142 Voltage Contr. Decay / Gate System A - 100 doepfer 4. In- / Outputs 5. User Examples ! Trig. In Since the A-142 is really a simple envelope, with just the one parameter to control, ideas for its use can include any of the occasions on which you might use the decay characteristics of an A-140 ADSR or A-141 VC-ADSR. Socket ! is where the trigger signal is patched in. " CV Control voltages for the decay time are patched in here.
PAGE 5
doepfer System A - 100 Voltage Contr. Decay / Gate A-142 random length. An interesting variation on this theme is to patch the output into a filter CV input, so that each new note has a different filter accent. Bringing an analogue sequence alive Clock A-155 1 2 3 4 5 6 The same sort of principle is used in the patch in fig. 3, where a normal note sequence controlled by the A-155 is brought to life by having different filter accents for each note.
PAGE 6
A-142 Voltage Contr. Decay / Gate System A - 100 Trigger doepfer Trig In VCD 1 0V Trig. In VCD 1 Env Out VCD 1 Inv. Gate Out Threshold VCD 1 0V Inv. Gate Out VCD 1 Trig. In VCD 2 Gate Out 0V Delay fig. 4: voltage-controlled trigger delay This sort of patch for delaying a trigger signal is very useful, for example, in producing delayed vibrato or other modulation. For more suggestions of uses, look at the user examples in the A-162 (Trigger Delay) manual.
PAGE 7
doepfer System A - 100 Voltage Contr.
PAGE 8
A-142 Voltage Contr. Decay / Gate System A - 100 doepfer 6. Patch-Sheet The following diagrams of the module can help you recall your own Patches. They’re designed so that a complete 19” rack of modules will fit onto an A4 sheet of paper. Photocopy this page, and cut out the pictures of this and your other modules. You can then stick them onto another piece of paper, and create a diagram of your own system.