DOEPFER A-100 Series Manual - Page 5

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Also for DOEPFER A-100 Series: Operating Instructions Manual (8 pages), Manual (16 pages), User Manual (12 pages), Assembly And Wiring Manual (6 pages), Manual (8 pages), Manual (6 pages), Connecting (8 pages)

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$ 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.

System A - 100

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 fre-

quencies (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

would be the synthesis of electric bass or drum

sounds, and filter sweeps, which slowly sweep

through the audio spectrum, emphasising different

harmonics.

• VCF - Keyboard CV

This modulation produces pitch-related filter ope-

ning: the higher the pitch, the more the filter opens,

and the brighter the sound becomes.

24 dB Bandpass

By combining the A-123 high pass filter with the A-122

low pass filter, it's possible to create 24 dB band

pass or 24 dB notch filters (as opposed to the

A-105 / A-122

•

24 dB Notch