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Sida 1/12
ODESSA
variable
spectrum har-
monic cluster
oscillator
Model of 1975
operator’s manual rev. 1975/1.2
2
SALUT
Thank you for purchasing this Xaoc Devices
product. Odessa is an additive oscil -
lator, which means the output signal is syn-
thesized by adding a multitude of sinusoidal
components (up to 2560 harmonic partials).
By manipulating their parameters it is possible
to obtain a broad range of unearthly sounds as
well as classic saw, square, and pure sine. Odes-
sa offers a set of controls for shaping harmonic
spectra based on number of partials and their
distribution in frequency and amplitude; all
of which is illustrated by a spectrum analyzer
comprising 12 multicolor LEDs. The series of
harmonics can be squeezed or spread apart,
tilted, or pruned by a comb-like frequency re-
sponse, resulting in a huge variety of spectra.
Animating the comb response yields radical
partials are frequency-related to a common
fundamental and controlled by a single volt/
octave input. Additionally, the signal can be fre-
quency modulated by exponential and linear
voices can be spread apart for a fat and dense
cluster, or a powerful chord.
INSTALLATION & SETUP
The module requires 24hp worth of free space
in the eurorack cabinet. Always turn the pow-
er off before plugging the module into the bus
board using the supplied ribbon cable. Pay
close attention to power cable pinout and
orientation. The red stripe indicates the neg-
ative rail and should match the dot or –12V
mark on both the bus board and the unit.
Odessa is internally secured against reversed
power connection, however, rotating the 16-
pin header may cause serious damage to
other components of your system because
it will short circuit the +12V and +5V power
lines. Always pay particularly close attention
to the proper orientation of your ribbon cable
on both sides! Also, observe that there are sev-
eral pin headers on the board. connecting
the power cable to an incorrect head-
er will destroy your odessa! The unit
should be fastened by mounting the supplied
screws before powering up. To better under-
stand the device, we strongly advise the user
to read through the entire manual before use.
MODULE OVERVIEW
-
rect access to all parameters in a one-knob-
per-function arrangement. Observe that it
also follows the traditional synthesis layout,
wherein pitch and voicing are controlled on
the left side, the main timbral features are
centrally located, and additional effects are
controlled at the right. Signal outputs are
located in the bottom array of jacks. The arc
of multicolor LEDs offers a rough overview of
the spectrum of the signal, from very low to
the highest audible frequencies.
Pitch frequency is controlled via the pitch
cv v/oct input
1
which accepts voltages
in –5V…+10V range. The coarse
2
and
fine
3
pair of potentiometers set the pitch
throughout the entire audible range (16Hz to
20kHz) without the need for external voltage.
Additionally, pitch can be modulated from the
exp fm input
4
that accepts ±5V, with depth
controlled by the dedicated attenuator above
5
. As with other Xaoc Devices products, the
slider LED illuminates to show the absolute
degree of modulation by lighting up for both
negative and positive voltages. Bear in mind
that while the pitch knobs alone cover the
entire frequency range, at extreme knob po-
sitions modulation from the exp fm input will
module
explained
3
not change the pitch any further. This limita-
tion does not include the pitch cv v/oct in-
put which is handled by a separate precision
A/D converter.
The big, central partials knob
6
limits the
harmonic partials, from 1 to 512 per voice.
This limit can also be controlled by CV using
the jack below
7
. Note that the response
appears to be stepped, especially at the be-
ginning of the range, because it causes con-
secutive partials to be turned on and off. At
the minimum position, only the fundamental
frequency is audible. Also note that due to au-
tomatic volume compensation, lower frequen-
cies become quieter as higher components are
added to the spectrum.
The red spectral tilt knob
8
controls how
quickly the amplitudes of consecutive partials
decrease with frequency. At the middle posi-
tion, partials decrease slowly, similar to the
spectrum of a saw wave. At the minimum po-
sition, the decrease is so rapid that mostly the
fundamental is audible. At the maximum posi-
additional comb response is engaged), which
results in a buzzy, narrow pulse waveform.
This parameter can be also controlled by ex-
ternal CV (±5V) via the dedicated jack
9
.
The three knobs near the right edge of the
panel control a comb-like frequency response
that is imposed on the spectrum. Note there is
certain settings), instead, a frequency-domain
shaping function is applied to the amplitude
of each harmonic partial. The density knob
10
controls how dense the notches of the comb
are: from zero (no notches at all) through
moderate (just a few notches) to a maximum
-
tered out (assuming minimum warp setting).
This parameter can be controlled by external
CV via the dedicated jack
11
that accepts
±5V, and is scaled by the slider potentiometer
above
12
. The warp knob
13
controls the
uniformity of the comb response: from linear,
where notches are equidistant in frequency
-
ear response, where notches are very dense
at the bottom of the spectrum and become
more distant for higher overtones (similar to
a phaser effect). This parameter can also be
controlled by CV via the dedicated jack
14
that accepts ±5V, and is scaled by the slider
potentiometer above
15
. The knob peaking
16
controls the shape of the comb response:
from narrow notches (at the minimum posi-
tion) through moderate up to wide notches
with narrow peaks in the response (at the
maximum position). This parameter can be
controlled by a ±5V CV via the jack below
17
.
tension
18
is a very important and sensitive
parameter that determines whether the sinu-
soidal partials generated by Odessa adhere to
a harmonic pattern wherein frequencies are
strictly integer multiples of the fundamental
frequency. There is a little dead zone in the
central position of this knob that helps to set
it to zero. With set to sharp (above tension
the middle), partials are more spread apart so
that their frequencies increase more quickly
than with a linear law (e.g. the harmonic se-
ries) and the spectrum becomes sparse. With
tension
are more condensed so that their frequencies
increase slowly and create a dense non-har-
monic cluster that may resemble noise. This
parameter can be controlled by a ±5V CV via
the jack below
19
.
Produktspecifikationer
| Varumärke: | Xaoc |
| Kategori: | ej kategoriserat |
| Modell: | Odessa |
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