Instruction Manual

A-121

VCF 2

System A - 100

doepfer

5. In / Outputs

! Audio In

This socket is the filter’s audio input. Patch the

output of a sound source (such as a VCO, noise

generator or mixer) into it.

" FCV 1

Socket FCV 1 is a voltage control input for the filter

frequency. It works to the 1 V / octave standard (like

a VCO).

If you patch 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 the VCF as a sine wave oscillator, connect

the pitch CV into this socket. Do the same if you want

the filter’s cut-off frequency to track exactly with the

pitch of a note.

§ FCV 2

Socket FCV 2 is another voltage control input for

the filter. Unlike CV 1, you can control the level of

voltage - the intensity of the modulation effect on the

filter - with attenuator 3.

$ QCV 1

This socket is the voltage control input for the filter’s

resonance. It works to the 1 V / octave standard (like

a VCO).

If you patch a modulation source (eg LFO, ADSR) to

this input, the resonance of the filter will be modulated

by its voltage: ie., the sound color of the frequencies

around the cut-off point changes according to the

voltage put out by the modulator.

% QCV 2

This is another voltage control input for controlling

the resonance, but unlike QCV1 it gives you the ability

to use Attenuator 5 to control the amount of voltage

control, and therefore the intensity of its effect on the

filter’s resonance.

& Notch • / High • ( Band • ) Low

Sockets & to ) are the filter outputs. They simulta-

neously carry the input signal modified by the

respective filter types (see Fig.1).