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attenuated signal unaffected by the pan con-
trol. The purpose of these outputs is to offer
individual mix components for multitrack-
ing, as well as to offer insert functionality
with the Hrad expander.
AUXILIARY OUTPUTS
Two aux send outputs, together with two
pairs of stereo aux return sockets allow
the user to patch two send effects. A dedicat-
ed bipolar aux knob in each channel allows
for manual control of the sends. By turning
the knob to the left or right of center, the sig-
nal is sent to auxiliary channel A or B respec-
tively. Sends are post-fader only, as they are
derived from the vca out signals.
The expander header on the back of the
module features insert points between each
channel's VCA and the aux selector to pro-
vide channel inserts and voltage control over
the aux level through dedicated Hrad inputs.
LEVEL INDICATORS
AND MIXING BUS LEVELS
Each of Praga's channels features an individ-
ual post-fader level indicator. The five LEDs
show the state of a standard volume detector
with thresholds at -32dB, -20dB, -12dB, -6dB
and 0dB referenced to a 10Vpp signal. Bear in
mind that eurorack electronic circuits cannot
handle voltages greater than 10V, therefore
it is impossible to mix four signals of 10Vpp
without serious distortion.
It is recommended to keep your attenuators
between 50% and 80% of the full range (un-
POWER
CONNECTOR
15
fig. 3
less your sources are very quiet). The mixing
bus in Praga features a soft clipping circuit
that offers a gentle overdrive for signals ex-
ceeding 16Vpp. This solution prevents the
harsh sounding distortion resulting from hard
clipping should the sum of your signals exceed
the dynamic range of the output stage. Addi-
tional control over the sum level is offered by
the Hrad expander at its dedicated stereo
sum outputs.
EXPANDABILITY
Multiple Praga units (or other compatible
mixer modules) may be chained to provide a
cascaded sub-mix setup such that the content
of the mix bus of all upstream units is inject-
ed 1:1 into the mix bus of every subsequent
unit appearing at its stereo sum outputs.
The chaining headers at the back of the mod-
ule should be connected with a 6-pin ribbon
cable
so that the out header
15
preceding unit goes into the in header
the following unit (fig. 3). The in header of the
first unit and the out header of the last unit
should remain unconnected.
6
1967 VOLTAGE CONTROLLED MIXING SURFACE
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