Doepfer A-198 Trautonium / Ribbon Controller - Manual (Page 6)

A-198 Trautonium / Ribbon Controller System A - 100 doepfer
6
5. User Examples
In the first place module A-198 and the accessory
position/pressure sensor is used to emulate the ma-
nual of the Trautonium. For details concerning the
principles of the Trautonium please look at our web
site www.doepfer.com or other web sites that deal with
the Trautonium subject. In combination with the Sub-
harmonic Oscillator A-113, the Trautonium Formant
Filter A-104 and some other modules a complete
reproduction of Oskar Sala’s Mixtur Trautonium is
possible.
Another evident application is the usage as a manu-
ally controlled voltage source that generates two
continuously variable analog voltages and two gate
signals that are derived from these voltages. Here are
some typical examples:
• CV
POS
as Pitch CV for one or more VCOs
Unlike a normal keyboard - that has only certain
voltages (normally 1/12 V grid) and consequently
only certain frequencies (semitones) available - the
A-198 manual outputs a infinitely variable voltage
CV
POS
that allows any VCO frequency, especially
finger-controlled glide effects and vibratos. By
means of the Quantizer A-156 it is possible to
generate semitone, scale or other intervals if
desired. Moving the finger up and down the position
sensor arpeggio-like effects are possible.
The gate signal Gate
POS
that is generated whenever
the position sensor is touched (hold switch in the Off
position) an envelope generator (ADSR) can be
triggered. The Release control of the ADSR should
be set to zero (see remark on pages 3/4).
• CV
PRES
as “After Touch“
CV
PRES
can be used to control the loudness of a
VCA or the filter frequency of a VCF with the pres-
sure applied to the pressure sensor while CV
POS
drives the pitch of the VCO(s).
• CV
POS
and CV
PRES
as any controller
Both control voltages CV
POS
and CV
PRES
can be used
to control any parameter in the A-100 that is voltage
controlled, e.g. phase or frequency shifting (A-
125/A-126), panning (A-134), morphing (A-144 +
A-135), pulsewidth (any VCO), LFO speed (A-147).
The modulation intensity (e.g. the amplitude modu-
lation of a VCA, frequency modulation of a VCF or
VCO, pulse width modulation of a VCO) can be
controlled by CV
POS
and CV
PRES
. For this the signal
level of a LFO or VCO is controlled by a VCA whose
control voltage is CV
POS
or CV
PRES
. Another applica-
tion is to add another sound (e.g. noise or sampler
or second VCO) dependent on CV
PRES
.
• Gate
POS
and Gate
PRES
as "Event Controller"
The Gate signals can be used to trigger events, e.g.
starting or stopping the Analog/Trigger Sequencer
A-155 or switching between sound sources by
means of the Voltage Controlled Switch A-150.