Doepfer A-132-1 Dual low cost VCA - Manual (Page 3)

doepfer System A - 100 Dual Low Cost VCA A-132
3
3. In / Outputs
! CV 1 • " CV 2
Sockets ! and " are the VCA’s control voltage
inputs. Whatever voltages are patched in here are
summed, and determine the amount of amplification
in the VCA (0 V: zero amplification; 5 V: maximum
amplification).
§ Sig. In
Patch the signal to be controlled by the VCA into input
socket §.
$ Sig. Out
The VCA output socket $ sends the signal out once
it’s been amplified by the sum of the control voltages
patched into the VCA.
4. User examples
Control of modulation amount by AM
In Fig. 1 an A-132 is added to the patch to make the
amount of modulation voltage-controlled. Each of
the VCAs has the following function in this patch:
• VCA 1 : A-130, control of AM
• VCA 2 : A-131, control of total volume
• VCA 3 : A-132, control of modulation amount
The control voltage for modulation amount (eg. from a
MIDI-CV interface) is patched in at point A.
Fig. 1: AM with voltage-controlled modulation amount
VCO
LFO
A
CV
CV
VCA 1
lin.
ADSR
VCA 2
log.
VCA 3
lin.