Doepfer A-104 four-fold Trautonium Formant Filter - Manual (Page 5)

doepfer System A - 100 Trautonium Formant Filter A-104
5
4. In- / Outputs
! Audio In
This is the filter’s audio input socket. Patch in the
output from the sound source (e.g. Subharmonic Ge-
nerator 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.
5. User Examples
Module A-104 is used in the first place for the simula-
tion of resonances.
Even vowel-like effects may be generated with this
module (refer to the user’s manuals of A-127 and
A-128).
In combination with the Subharmonic Generator A-
113 one obtains a nearly complete replica of the
Trautonium sound generation (refer to the user’s
manual of A-113 on page 11 for the complete sketch).
More detailed information about the Trautonium and
the realization with A-100 modules can be found on
our internet site www.doepfer.com
.
A module that’s related very close to the A-104 is the
A-127 Voltage Controlled Resonance Filter. In
contrast to the A-104 the filter frequencies are voltage
controlled and each filter has an own LFO for fre-
quency modulation. This enables automatic filter
sweeps or multiple voltage controlled filtering (e.g. with
sequencer or MIDI-to-CV interface).
For filter applications with fixed frequencies the Fixed
Filter Bank A-128 may be used.