User manual
5
increase by mixing some inverted input into
the variable feedback that controls the res-
onance (which results in a weaker response
at bass frequencies), by introducing nonlin-
ear saturation into the variable feedback (it
attributed to “fatness”), or by providing ad-
vanced dynamics processing.
The feedback in Zagrzeb (which is necessary
for satisfying the state variable equation)
changing the feedback, but by shifting the in-
dividual poles of the transfer function.
We have decided not to compensate for the in-
creased gain, instead, aiming at a smooth and
natural response up to the clipping point. The
range of resonance is trimmed, though, so that
the clipping point is hardly reached and is there-
fore non-intrusive. It is also one of the reasons
Zagrzeb is by design incapable of self-oscillation.
VOLTAGE CONTROL
The two CV inputs at the bottom of the panel
control the cutoff frequency throughout the
entire audio range.
The variable fm 1 input is equipped with an
attenuverter featuring a center detent. Note
that the range of this knob is up to ±0.5V/oct
(in other words: ±2oct/V), which is twice as
fm 2 thereby facilitat-
ing extreme sweeps while retaining shallow
modulation near the middle position thanks
to the attenuation curve of the potentiometer.
fm 2 is not calibrated, but it
provides fairly accurate tracking at 1V/oct.
STEREO PROCESSING AND EFFECTS
stereo signal with the same characteristics,
Zagrzeb offers additional animation of the
stereo image by introducing subtle changes
to the cutoff frequency. The spread input is
conveniently scaled at 1/10th the sensitivity of
the fm 2 input. 0V at the spread input has no
effect, while positive and negative CV results
opposite directions.
Patching a mono signal to the left input creates a
pseudo-stereo effect. A special multi-stage phase
shifting network introduces a slight delay be-
tween the left and right outputs, thus making a
stereo output signal with a wider image. Please
note, the effect is most noticeable with rich
sounds that change over time and may be less
spectacular with a static VCO waveform.
PATCH IDEAS
-
sponse, even though Zagrzeb does not offer it
high pass 24 outs and invert and mix them
with the low pass 24 outs (in other words,
subtract them). Note: The effect is most pro-
nounced with resonance set to minimum.
-
ters. Patch a 5-10V CV offset into the spread
jack, mix the outputs of the two band pass
outputs, and set the resonance high.
• It is possible to achieve a steep 48dB/oct low
of Zagrzeb’s channels. For a low pass response,
plug the audio signal into the input of the left
channel, then patch from the left low pass 24
output to the input of the right channel, and use
the right low pass 24
ACCESSORY
Our Coal Mine black panels are available for
all of Xaoc Devices modules. Sold separately.
Ask your favorite retailer. •
patch
ideas