Owner manual

ManualsBrandsDoepfer ManualsAudioA-104 four-fold Trautonium Formant Filter

doepfer

System A - 100

Trautonium Formant Filter

A-104

1. Introduction

Module

A-104

is a replica of the

Formant Filter

of the

“Mixtur Trautonium” by Oskar Sala. It is made of

four parallel resonance filters with common input

and output (see fig. 1 on page 3). Each filter can be

switched to low pass or band pass or off. Frequency,

resonance, mode

(band/low/off) and

level

are con-

trolled for each filter separately by hand (no voltage

control !). The frequency range for each filter is about

50Hz...5kHz.

The input level for all filters is controlled by an at-

tenuator. The filter audio inputs are very sensitive so

that distortion may intentionally be used to create new

sounds - if desired.

The A-104 is a versatile module for sound modifica-

tion. In the first place it is used for reproduction of

resonances (e.g. the vocal-like effects known from

the Trautonium). In combination with the

subharmo-

nic generator A-113 one obtains the complete replica

of the Trautonium sound generation.

More detailed information about the Trautonium can

be found on our internet site www.doepfer.com

A-104

Audio

Resonance

Frequency

Level

VCF 1

Audio

Out

Input

Level

VCF 2 VCF 4

Mode

Summary of content (6 pages)

PAGE 1
System A - 100 doepfer Trautonium Formant Filter A-104 1. Introduction A-104 Input Level Audio In Level VCF 1 Frequency Resonance Mode VCF 2 Audio Out VCF 4 Module A-104 is a replica of the Formant Filter of the “Mixtur Trautonium” by Oskar Sala. It is made of four parallel resonance filters with common input and output (see fig. 1 on page 3). Each filter can be switched to low pass or band pass or off.
PAGE 2
A-104 Trautonium Formant Filter System A - 100 2.
PAGE 3
doepfer Fig. 1: System A - 100 Trautonium Formant Filter A-104 Sketch of the A-104 3. Controls 1 Input Level Attenuator 1 adjusts the level of the audio input signal applied to the audio input socket !. The attenuated signal is fed to each of the four resonance filters. H The audio inputs of the filters are very sensitive so that distortion - even with normal A-100 audio levels (e.g. VCO A-110) - may intentionally be used to create new sounds.
PAGE 4
A-104 Trautonium Formant Filter Out Frq. Out System A - 100 3 Resonance Frq. Res. Control 3 is used to adjust the filter resonance (or emphasis or Q, see fig. 2): • In band pass mode i.e. the band width • In low pass mode i.e. frequency emphasis around the cutoff frequency Res. fM doepfer Freq. f C Freq. Fig. 2: Frequency response of band pass and low pass 2 Freq. Self-oscillation - as for some other filters of the A-100 (e.g. A-120, A-121, A-122, A-123 and so on) - is not available.
PAGE 5
doepfer System A - 100 Trautonium Formant Filter A-104 4. In- / Outputs 5. User Examples ! Audio In Module A-104 is used in the first place for the simulation of resonances. This is the filter’s audio input socket. Patch in the output from the sound source (e.g. Subharmonic Generator A-113, VCO A-110/A-111, Noise Generator A-117/A-118, Mixer A-138). " Audio Out Filter output socket " sends out the filtered signal, i.e. the sum signal of the four resonance filters.
PAGE 6
A-104 Trautonium Formant Filter System A - 100 doepfer 6. Patch-Sheet The following diagrams of the module can help you recall your own Patches. They’re designed so that a complete 19” rack of modules will fit onto an A4 sheet of paper. A-104 Trautonium Formant Filter Input Level Frequency Resonance Mode Level Band Photocopy this page, and cut out the pictures of this and your other modules. You can then stick them onto another piece of paper, and create a diagram of your own system.