DOEPFER A-100 Series Manual - Page 4

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A-123

VCF 4

At close to maximum resonance, the filter starts to

self-oscillate, and behaves like a sine wave oscilla-

tor. Thanks to this effect, you can use the filter as an

independent tone source.

Resonanz

0 db

Fig. 2:

How resonance affects the behaviour of a

high pass filter.

System A - 100

Frequenz

f c

4. In / Outputs

! Audio In

This is the filter's audio input socket, where you

patch in the output from any sound source.

" FCV 1

Socket FCV 1 is a voltage control input for the filter.

It works on the 1V / octave rule, like the VCOs.

If you connect the output of a modulation source (eg

LFO, ADSR) to this input, the cut-off frequency of the

filter will be modulated by its voltage: ie, the sound

color changes according to the voltage put out by the

modulator.

If you use this VCF as a sine wave oscillator,

connect a pitch control voltage to this input.

Do the same if you want the filter's cut-off

frequency to track exactly with the pitch of a

note.

§ FCV 2

Socket § is also a voltage-control input for the filter.

Unlike on socket ", though, you can adjust the level of

voltage by using the attenuator 3, and thus control the

intensity of modulation effect on the filter.

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