Doepfer A-104 User Manual
doepfer
System A - 100
1. Introduction
Trautonium Formant Filter
A-104
Input
Leve l
A-104
Audio
In
Level
Frequency
VCF 1
Reso na n ce
Mode
VCF 2 VCF 4
Audio
Out
Module
“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
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 attenuator. 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
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
is a replica of the
A-104
Formant Filter
(band/low/off) and
are con-
level
subharmo-
.
of the
1
A-104
Trautonium Formant Filter
System A - 100
doepfer
2. TFF - Overview
➀
➊
➋
A-104
Input Level Frequency Resonance Mode Level
10
0
Audio In
Audio Out
Trautonium Formant Filter
0
0
0
0
Controls:
1 Input Level : Attenuator for audio input
signal (effective for all filters)
Band
10
10
10
10
10
0
Band
0
10
Band
0
10
Band
0
10
Low
Low
Low
Low
0
0
0
0
1
: Frequency control
Frq.
10
10
2
Resonance : Resonance control (Q, em-
3
2
Mode : Mode switch (band/off/low)
4
5 Level : Level control (share of the
3
10
10
In- / Outputs:
Audio In : Common filter audio input
!
4
" Audio Out
For each VCF:
phasis)
filter signal in the mix output)
: Common filter audio output
➁
➂
➃
➄
2
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