Doepfer A-109 Voltage Controlled Audio Signal Processor - Manual (Page 6)

A-109 VC Signal Processor System A - 100 doepfer
6
4 Res.
With this control you adjust the filter’s resonance (or
emphasis or Q factor) - the parameter which emphasi-
ses the frequencies around the cut-off point f
C
(see Fig.
2). Close to its maximum setting, the filter becomes so
resonant that it goes into self-oscillation, and starts
behaving like a sine wave oscillator. You can take
advantage of this effect, and use the VCF as an
additional oscillator.
The actual resonance results from the sum of the
manual control 4 and the external control inputs
CVQ1 and CVQ2.
5 CVQ1
For voltage control or modulation of the resonance,
use the resonance CV inputs §. Use attenuator 5 to
adjust the control voltage level of the resonance CV
input CVQ1.
6 Amp.
With this control you adjust the VCA’s amplitude (or
audio level). The main VCA has a combined expo-
nential/linear control scale:
• exponential from about 0...+200mV
(corresponding to about -100dB ... -20dB attenua-
tion)
• linear from about 200mV...+5V (corresponding to
-20dB...0dB attenuation)
The "rounded" knee at the scale bottom allows an
envelope to decay to zero with a natural exponential
sound.
7 CVA1
For voltage control or modulation of the VCA ampli-
tude, use the amplitude CV inputs &. Use attenuator 7
to adjust the control voltage level of the amplitude
CV input CVA1.
8 Pan
With this control you adjust the modules panning
setting - the parameter that defines the amplitude
relation between the audio outputs Pan Out L and Pan
Out R (=), resp. the position of the audio signal in a
stereophonic environment.
The middle position of this control corresponds to
equal amplitude for both outputs, resp. middle stereo
position.