Doepfer A-130/A-131 VCA (linear / logarithmic) - Manual (Page 5)

doepfer System A - 100 VCA A-130 / A-131
5
4. In / Outputs
! CV 1 • " CV 2
Sockets ! and " are control voltage inputs, whose
voltages are combined. The effective range of the VCA
goes from 0 V (no amplification) to +5 V (maximum
amplification).
§ Audio In 1 • $ Audio In 2
The signals you wish to amplify are input through audio
inputs § and/or $.
% Audio Out
The output signal here is the audio inputs amplified by
the VCA..
5. User examples
Typical voltage controlled amplification
A standard VCA patch is shown in Fig. 4. An ADSR
envelope produces a time-dependent amplification
curve, which can affect any sound source you choose.
The curve can be very quick (with a fast envelope) or it
can produce long, slow changes in the volume of a
sound.
Fig. 4: Time dependent amplification using an ADSR
NOISE
ADSR
Au di o
In 1
CV 2
C V 2
Ga in
A-131
V C A-EX P.
In 1
Aud io Ou t
Out