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module
explained
SALUT
Thank you for purchasing this Xaoc Devices
product. Praga
[ˈpraɡa]
four-channel voltage controlled mixer featur-
ing a stereo mixing bus, two auxiliary sends
with stereo returns, clickless muting, dedicat-
ed modes for unipolar and bipolar voltage
control over volume, DC-coupling, and a su-
per-clean signal path obtained via high-quali-
ty VCA and opamp chips.
We have carefully crafted Praga's voltage
control response to achieve what we believe
to be the optimal user experience found in an
eurorack mixer. The design features an elabo-
rate control circuit that combines the internal
voltages generated by the panel potentiom-
eters with external CV over volume and pan
(fig. 2). The result is a natural attenuator re-
sponse that constrains VCA gain to an usable
range while minimizing distortion.
INSTALLATION
The module requires 20hp worth of free
space in the eurorack cabinet. The ribbon
type power cable must be plugged into the
bus board, paying close attention to polar-
ity orientation. The red stripe indicates the
negative 12V rail and should align with the
dot, –12V or red stripe marks on both the
unit and the bus board. The module itself is
protected against reversed power connec-
tion, however reversing the 16-pin header
may cause serious damage
ponents of your system by short-circuiting
the +12V and +5V power rails. The module
should be fastened by mounting the supplied
is an expandable
to other com-
screws before powering up. To better under-
stand the device, we strongly advise the user
to read through the entire manual before
using the module.
MODULE OVERVIEW
Praga's front-panel topology (see fig. 1) re-
sembles a typical mixer with four identical
channels. The vol knobs
ual control of each channel's respective lev-
el. Each channel's response depends on the
selected control mode (see: 'Volume Control'
later in this manual). The illuminated ac-
tive|mode button
the channel or switch between the two control
modes. The pan knob
position in the stereo panorama. The bipolar
aux knob
4
adjusts the amount of signal
sent to either auxiliary channel. The five-bar
LED level indicator
post-fader level, while the lower section con-
tains the sockets for signal input
vca out
7
, CV inputs for pan
control
9
. The bottom row of sockets is com-
mon to all four channels and consists of a pair
of stereo sum outputs
outputs
11
and two pairs of stereophonic aux
return inputs
12
VOLUME CONTROL
Praga offers two modes of combining incom-
ing control voltages with attenuator settings.
The mode is selected individually in each
channel by a long press of the illuminated
active|mode button. Mode switching is
also possible while the channel is muted, con-
firmed by a short blink.
2
allow for man-
1
allows the user to mute
2
3
adjusts the channel's
5
displays the channel's
6
, direct
8
and vol
10
, two aux send
.
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