DOEPFER A-100 Series User Manual

doepfer
System A - 100
VCF 4 A-123
5
$ QCV
This socket is the voltage control input for the filter’s
resonance.
If you patch a modulation source (eg LFO, ADSR) to
this input, the resonance of the filter will be modulated
by it: increases in voltage will increase the amplitude
of the frequencies around the filter cut-off point.
% Audio Out
Filter output
%
sends out the filtered audio signal.
5. User examples
The filter’s cut-off frequency can be modulated in
various ways:
• VCF - LFO
Modulation of the cut-off frequency produces cycli-
cal changes of the sound spectrum. At low
frequencies (c. 1 - 5 Hz), you get a "Wah-Wah"-
effect
. Modulation in the audio range produces
interesting sounds; the same principles apply here
as with frequency modulation of the A-110 VCO
(see chapter 6).
• VCF - ADSR
Modulation by an envelope results in gradual
change of the
sound spectrum
. Typical uses
include filter sweeps, which slowly sweep through
the audio spectrum, picking out different harmonics
in turn.
• VCF - Keyboard CV
This modulation produces pitch-related filter ope-
ning.

DOEPFER A-100 Series Specifications

General

Brand	DOEPFER
Model	A-100 Series
Category	Control Unit
Language	English