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Voltage Controlled Stereo Mixing Console Model of 1967 Operator's PRAGA voltage controlled stereo mixing console operator’s manual rev. 1967/1.0 Model of 1967 module explained SALUT screws before powering up. To better under- stand the device, we strongly advise the user Thank you for purchasing this Xaoc Devices to read through the entire manual before product. Praga is an expandable four-channel using the module. voltage controlled mixer featuring a stereo mixing bus, two auxiliary sends with stereo MODULE ovErvIEW returns, clickless muting, dedicated modes for unipolar and bipolar voltage control over Praga's front-panel topology (see fig. 1) re- volume, DC-coupling, and a super-clean signal sembles a typical mixer with four identical path obtained via high-quality VCA and opa- channels. The vol knobs 1 allow for man- mp chips. ual control of each channel's respective lev- el. Each channel's response depends on the We have carefully crafted Praga's voltage selected control mode (see: 'Volume Control' control response to achieve what we believe later in this manual). The illuminated ac- to be the optimal user experience found in an tive|mode button 2 allows the user to mute eurorack mixer. The design features an elabo- the channel or switch between the two control rate control circuit that combines the internal modes. The pan knob 3 adjusts the channel's voltages generated by the panel potentiom- position in the stereo panorama. The bipolar eters with external CV over volume and pan aux knob 4 adjusts the amount of signal (fig. 2). The result is a natural attenuator re- sent to either auxiliary channel. The five-bar sponse that constrains VCA gain to an usable LED level indicator 5 displays the channel's range while minimizing distortion. post-fader level, while the lower section con- tains the sockets for signal input 6 , direct INSTALLATION vca out 7 , CV inputs for pan 8 and vol control 9 . The bottom row of sockets is com- The module requires 20hp worth of free mon to all four channels and consists of a pair space in the eurorack cabinet. The ribbon of stereo sum outputs 10 , two aux send type power cable must be plugged into the outputs 11 and two pairs of stereophonic aux bus board, paying close attention to polar- return inputs . ity orientation. The red stripe indicates the 12 negative 12V rail and should align with the VOLUME CONTROL dot, –12V or red stripe marks on both the unit and the bus board. The module itself is Praga offers two modes of combining incom- protected against reversed power connec- ing control voltages with attenuator settings. tion, however reversing the 16-pin header The mode is selected individually in each may cause serious damage to other com- channel by a long press of the illuminated ponents of your system by short-circuiting active|mode button. Mode switching is the +12V and +5V power rails. The module also possible while the channel is muted, con- should be fastened by mounting the supplied firmed by a short blink. 2 front panel overview fig. 1 1 3 4 6 8 11 10 3 1. UNIPOLAR MODE Unipolar mode (button lit green) is designed for unipolar control voltages commonly found in envelope generators. In this mode, the attenuator knob controls offsets to the incoming CV, allowing the dynamic response to CV to be retained regardless of attenua- tor position (fig. 4a, 4b). With attenuators at maximum, a CV of 8V opens the channels to 0dB, while closing the attenuators allows 2 silencing the channels to -85dB. Control voltages above 8V are well-tolerated, how- ever, the gain response is strongly tempered above 0dB, offering only up to +3dB so as to minimize distortion. This behavior affects the sound in a way similar to dynamic com- pression, however lowering the attenuators diminishes the effect, eventually bringing it 5 down to a non-compressed operation. 2. BIPOLAR MODE Bipolar mode (button lit red) is designed for 7 bipolar control voltages commonly found in LFOs. In this mode, the attenuators act by scaling the CV together with an internally generated offset voltage. Therefore the depth 9 of amplitude modulation (in dB) decreases as the channel is lowered. The response is optimized for control voltage in the range of -5V to +5V, whereby a fully-open attenuator offers 0dB at +5V and turning it fully coun- terclockwise yields an attenuation of -56dB with no modulation (see fig. 5a, 5b). Again, higher amplitudes of the CV are well-toler- ated, however, the response is strongly com- 12 pressed above 0dB. 4 block diagram VCA VCA chain chain output output input output main summing bus stereo output aux summing bus AUX sends aux aux insert insert point point control vu control vu signal pan vol mute signal pan vol mute AUX input input return 1+2 CV CV CV CV pan volume pan volume 1 2 3 4 fig. 2 CHANNEL MUTING PAN CONTROL Regardless of the current mode, a short-press Praga offers both manual and CV control on the active|mode button silences the cor- over the position of each channel in the out- responding channel. This state is indicated put stereo panorama. The pan knobs act by the deactivation of the corresponding as offsets to the pan input control voltages LED. Clickless action is achieved by introduc- which are expected in the range of -5V to ing a few-millisecond fade-out to near -90dB. +5V. The response of the combined controls Pressing the button again brings the channel provides equal loudness in a near-field mon- back through a similar clickless fade-in and itoring setup (3dB pan law), however as channel gain approaches 0dB, the response reactivates the LED. is slightly compressed so as to prevent an in- The operation of mutes can be controlled crease of loudness (see fig. 6). remotely through the expander pins at the VCA OUTPUTS back of the unit. The planned Hrad expan- sion module offers four gate inputs for auto- A direct vca out on each channel uses a sep- mated channel muting. arate VCA chip to provide a pure copy of the 5 POWER 03.2017 REV. 1967 VOLTAGE CONTROLLED MIXING SURFACE CONNECTOR attenuated signal unaffected by the pan con- 15 13 14 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- fig. 3 ed bipolar aux knob in each channel allows for manual control of the sends. By turning less your sources are very quiet). The mixing the knob to the left or right of center, the sig- bus in Praga features a soft clipping circuit nal is sent to auxiliary channel A or B respec- that offers a gentle overdrive for signals ex- tively. Sends are post-fader only, as they are ceeding 16Vpp. This solution prevents the derived from the vca out signals. harsh sounding distortion resulting from hard The expander header on the back of the clipping should the sum of your signals exceed module features insert points between each the dynamic range of the output stage. Addi- channel's VCA and the aux selector to pro- tional control over the sum level is offered by vide channel inserts and voltage control over the Hrad expander at its dedicated stereo the aux level through dedicated Hrad inputs. sum outputs. LEVEL INDICATORS CHAINING MULTIPLE UNITS AND MIXING BUS LEVELS Multiple Praga units may be chained to pro- Each of Praga’s channels features an individ- vide a cascaded sub-mix setup such that the ual post-fader level indicator. The five LEDs content of the mix bus of all upstream units show the state of a standard volume detector is injected 1:1 into the mix bus of every sub- with thresholds at -32dB, -20dB, -12dB, -6dB sequent unit appearing at its stereo sum and 0dB referenced to a 10Vpp signal. Bear in outputs. The chaining headers at the back of mind that eurorack electronic circuits cannot the module should be connected with a 6-pin handle voltages greater than 10V, therefore ribbon cable so that the out header of it is impossible to mix four signals of 10Vpp 15 13 without serious distortion. the preceding unit goes into the in header 14 of the following unit (fig. 3). The in header of It is recommended to keep your attenuators the first unit and the out header of the last between 50% and 80% of the full range (un- unit should remain unconnected. • 6 control characteristics 10 10 Gain [dB] Gain [dB] 0 fig. 4a 0 fig. 5a -10 unipolar (green) mode bipolar (red) mode gain vs. cv -10 gain vs. cv for different for different -20 attenuator attenuator 10 settings settings 10 -20 8 -30 7 -30 5 -40 4 -40 3 -50 2 2 -60 -50 1 -70 -60 0 1 2 3 4 5 6 7 8 9 10 -5 -4 -3 -2 -1 0 1 2 3 4 5 Volume control voltage (unipolar) Volume control voltage (bipolar) 10 10 Gain [dB] Gain [dB] 0 fig. 4b 10V 0 fig. 5b -10 unipolar (green) mode bipolar (red) mode 5V gain vs. attenuator 8V -10 gain vs. attenuator settings for settings for -20 different cv different cv -20 0V -30 5V -30 -40 -40 -5V -50 -60 -50 -70 -60 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10 Attenuator setting Attenuator setting 0 Pan response -10 -20 -30 -40 5 -50 8 fig.
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