VOSTOK - Studio 250
Contents
1. OUODODODODODOoOOoogOoooo Coo o0 ooo iac ar oar T o M 44M LV SISMJL PATCH PAWEL TEAST Goi zu TSH LX uu 1 drew ELITS Wa T An 4c 931 1 x 00 ee EIT e zuo a P HEF AOH HDI Cy STICK x LI 2 OOO ODIO CHO OO OO GDOD ooo ood ooo ooo 900000000 ocrrrul mc GAUGE AR 35295 I A C 7 B mM m 78 m Fg E F E F a B f Ls AM DAAA Inputs MIDI In Controls MIDI program push button Manual trigger push button Overview MIDI CV Converter Outputs Indicators2. 7 B mM 35295 A C mc AR Legato When 1 or more notes are overlapped this output will change from O to 5V It will return to when no notes are overlapping This output is ideal for triggering other modules inputs such as sequencer reset or clock VCF cut off etc Accent When a MIDI velocity of over 79 is received the Accent output will go from 0 to 5V It will not return back to OV until it receives a MIDI note velocity value of less the 80 This output is ideal for accenting notes by connecting it to the VCA or filter cut off input It could also clock a sequencer or other module Note it does not respond to pitch bend TRIG Button This is a manual trigger button sending a gate signal to the Gate socket It can be used to manually trigger the envelopes or manually clock the sequencer when patched to those control inputs MIDI Channel Selection and CV2 Control Source Assignment Press the Program Button Then either Press a MIDI key CV2 will be set to Velocity or move the Modulation Wheel CV2 will be set to Mod Wheel The MIDI receive channel will be set to that of the MIDI message received mentioned above REI A mM m E M ve ELA T 4D RE r rmm m Fg E F E F a B f Ls P OE AM DAAA SBOLITIIISS Voltage Controlled Oscillators 1 amp 2
3. A 7 VON 19K eames xx user manual Neel Contents wies p TEAR 3 Safety Inst codd da od reddi a eee ADAE cat 6 OE rS 7 MIDIG V peu pu EE 14 Voltage Controlled Oscillators 1 amp 2 1 amp 2 17 Oscilator SY MC a i e P dina vr ie Uses Ann 19 Voltage Controlled Wavetable Oscillator 20 VO EP OS ery oe 24 Envelope Generators 1 amp 2 eene nennen 25 ec desee CD ea C 27 8 Step CV and Gate 28 Joystick COMMONS pr 31 VC Multimode Filter VCA HPF LPF 33 RING MEE IR 36 6 Input Audio CV Gate Mixer with Inverter 37 Split 39 Adaptor EXIGI Mall ME 39 7 T mM m p 0 B OA E f O T Specification 234256 Matrix patch combinations 484 Matrix patch panel points 69 Sockets 52 Rotary controls 13 LEDs 20 Switches 2 Displays Size Dimensions shown do not include feet handles catches c
4. CV 1 pitch Gate LED CV 2 control Gate Legato Accent NOTE the MIDI circuit has been improved As a consequence the fine tune trimmer is no longer needed and has been omited The MIDI to CV Converter MCV is a quick and easy to use module that allows control of other Vostok modules from a MIDI controller The MCV offers is straight forward MIDI to CV conversion It is perhaps not suited to the live musician as it does not have many realtime live playing type parameters like pitch bend or aftertouch but these are not really needed for the sequencing musician which this device is aimed at Use Connecting Connect the MIDI sequencer or other MIDI device to the MIDI input of the MCV Normally CV1 goes to the pitch CV of a VCO CV2 goes to any other control input such as filter cut off Gate goes to the Trigger input of an envelope or the clock in of the sequencer Make sure the MCV is on the right MIDI receive channel and away you go Details LED The gate activity light will be lit whenever there is a gate voltage present i e whenever a MIDI Note is on CV1 The pitch CV out CV1 conforms to 1V per Oc tave CV2 The controller CV out CV2 responds to MIDI con troller 1 mod mheel or MIDI velocity depending how it is set up The range is 0 to 10V range Gate When a MIDI note is on a 10V gate signal is sent to the Gate socket
5. sic analogue synths or older style hi fi s and mixing desks A meter is basically a device that shows voltage level via a moving needle A meter is by no means an essential device on a synthesiser but itis a handy diagnostic tool to check if signals are present for instant non audio signals like CVs as well as giving a rough guide to intensity voltage level It will also make your modular system look that much better and give it an even more vintage look Details A moving coil meter differs from the more modern LED bargraph displays in that it does not react instantly to quick and big changes in voltage It takes a small amount of time for the needle to move to its new position So if there are quick changes in voltage like square wave the needle may not have time to move to the new position before the wave shape changes A moving coil gives an average reading of signal Use The input to the meter is hard wired from the Mixer output So to use the meter your audio or CV must be patch to the Mixer input via the front panel sockets or the matrix board The signal is rectified to remove any negative voltages This is necessary as the meter only measures positive voltages As the signal is rectified negative signals will not register on the meter Before patching a signal to the meter turn the meter range to zero With the signal present slowly increase the range till the needle moves Try not to let the needle overload full
6. VCO 1 amp 2 Inputs Outputs Controls VCO CV Saw Tune VCO PW Square Glide VCO Sync Pulse Width Saw Level Square Level PEH vy ku Puy hee 23 aet Overview The is usually the first in the signal chain for creating a synth patch It provides the raw un processed audio waveform for subsequent filtering and processing Each VCO provides two waveforms sawtooth and square wave The square wave s pulse width can be manually or CV modulated for a chorusing effect which beefs up the sound Both VCOs also have a glide slew generator for creating portamento effects They also feature Sync inputs Note if a patch lead or pin is disconnected from the pitch CV input in some instances it may hold the last voltage it received keeping the pitch transposed to that level This is because the VCO circuit has a kind of sample and hold circuit as part of the way it works The sampled voltage may be over ridden by patching the pitch CV to another source A B mM 32989 B d a ES Controls In Detail Tune Turning Tune alters the pitch of the oscillator Range approx 1 1 Octave Glide Turning up Glide adds portamento to the oscillator so the pitch will bend slide up or down to each note as opposed to a sudden change The higher the setting the longer the oscillator takes to reach its new note Not many VCO modules give you the al
7. at each step where the CV control is not at the zero position i e Gate on Step Button This allows the sequencer to be manually stepped by one step at a time CV Gate pots Range switch There are 8 CV pots 1 for each step When the range switch is HI the range is approximately 0 to 10V when LO the range is approximately 0 5V LO is best for use when controlling a VCO as this gives better abillity to fine tune each step The Gate switches are built into the CV control Pull the control out to turn off the Gate for that step push it in to turn the Gate on LED Indicators There are 8 LED s These will light in turn to show step position 7 B mM m FP a M ve ELA T AR Alternative Applications Of Controls Clock In The sequencer does not have to be stepped through at normal regular intervals as is usual It can be clocked from any source such as the gate from the MIDI CV converter This allows it to step through the sequencer rhythmically as and when you want If a sine triangle or sawtooth wave that goes positive and negative in polarity is used the sequencer will step randomly backwards and forwards and also skip beats This can produce interesting musical results or is good for sound effects Reset In It can be taken from an source such as Gate from the MIDI to CV converter or from the sequencer s own Gate output Using the Gate output enables you to a
8. LFO or EG to reduce the wavetable sweep to a desirable level Volume This alters the main audio output level Sockets Pitch This is the Pitch CV input level to change the note played The pitch is not continuously vari able as this is a digital device The pitch is quantised to the nearest semitone This rules out the need for an external CV quantiser which is required with analogue VCOs when equal semitones are required When out of range XX is displayed and a high pitch wave is sounded Wave This allows the wave number to be selected or for the wavetable to be swept by an external voltage generator like sequencers LFOs EGs etc For any effect the Wave CV Level must be above zero Range 0 to 5V Bank CV see Bank Switch Out This is the main audio output signal that would normally be fed to the next modules normally a VCF for further processing Range 0 to 10V Aliasing 8 bit samples suffer from lower quality sound and aliasing compared to more commonly used 16 bit samples But this is not a bad thing many musicians still prefer the characteristic sound of 8 bit samples just in the way that analogue circuits have a character and indeed this is why early 8 bit digital instruments such as PPGs and drum machines like DMX Linn etc are still so popular Other Points To Notes The VCO can produce notes from to After B4 XX is displayed and a high pitch wave is sounded to indicate the unit is out of r
9. This way repeating melodic lines can be produced The se quencer need not control pitch it could be used to change the filter cut off volume or LFO speed The advantage analogue sequencers have over hardware sequencers is firstly their immediacy Having all the controls switches and sockets in front of you al lows quicker programming as the output is an analogue control voltage and not a digital MIDI signal the output of analogue sequencers can easly be mixed with other voltages or processed in some way apes mc GAUGE AR a a Controls In Detail Clock In The sequencer requires a clock signal to run Each clock signal will advance the sequencer 1 step When the last step is reached it resets back to the first step Take the clock signal from a square wave LFO or MIDI to Gate converter Clock Thru The clock signal appearing at the CLOCK IN socket is buffered and transferred to the CLOCK THRU socket so it can be daisy chained to another sequencer Reset In A 5V signal in here will reset the sequencer to step 1 Step 1 Out Each time step one is played the step 1 gate socket will go high output 5V This socket can be used to trigger other devices The step 1 out will give a clock signal that is the main clock in divided by 8 CV Out This socket will output a control voltage set by the pot for the current step It can be changed in real time Gate Out This socket will output a 10V gate signal
10. ally dieing away It can also be used to change the timbre of a sound over time by controlling the cut off frequency of a VCF The attack time adjusts the rate at which the envelope will rise to its peak value This is initiated with a Gate signal The Decay ad justs the rate the signal takes to fall to the Sustain level The Sustain level adjusts the level that the EG signal will sustain from the end of the Decay time till the end of the Gate signal i e when the key is release The Release time adjusts the rate the signal takes to fall from its current level to zero after the end of the Gate signal when the key was released If a short Trigger signal is used to initiate the EG there will be no Decay or Sustain portion to the EG signal The signal will rise to peak level Attack then imidiately fall from peak to zero at the Release rate After receiving a Gate signal this sets the time is takes the envelope to reach full level Decay After reaching full level this sets the time it takes the envelope to decrease to the Sustain level 7 mM m 8 B BUS PARA M ced GA AR ee RR Sustain The sets the Sustain level The envelope signal will remain at the Sustain level after decreasing from the maximum level as long as there is a Gate signal present at the Trigger in socket i e as long as a key is held down Release After the key is released the Gate signal no longer present this sets t
11. ange It is very are for a CV to Digital device such as this VCO to know exaclty which note to play for the corresponding voltage The scaling of your control source need only be a little out due perhaps to temperature change line noise movement in transport and it may register a higher or lower note than you expect Our experience is that the Wavetable VCO is best used with the internal sequencer VCO3 is by no means if you compare it to modern digital synths but you should find it a welcome addition to traditional analogue modular design 7 mM hE BTE A __ m MX nA naam m 78 m Fg E F E F a B f Ls RE AM DAAA MOILOINGSW VC LFOs 1 amp 2 Inputs Outputs Freq CV Ramp Rev Ramp Tri Square LFO Controls Ramp Rev Ramp Level Select Tri Square Level Select Indicators LFO Speed Overview The LFO module has 4 waveforms available on 2 outputs Use the LFO to control another module such as a VCO to create vibrato a for tremelo or to control a filter s cut off frequencer wah wah filter sweep Use it any where you want to change a module s character over time Controls In Detail Speed This sets the LFO frequency speed Ramp Reverse Ramp Level Select Switch Sets the output level to the Ramp sawtooth out jack of the Ramp signal This control has a built in push pull switch Pull the control ou
12. ate resonance controls also known as Q The filter can be used on its own as a filter by turning up the VCA Level but it includes a VCA this means straight away it can be used with envelopes without the need of a separate VEAL 4 Korg MS20 a um QU The filter types used are 124 roll off S as indentical as can be to those used in I fb OLT the classic Korg MS20 General Use The controls have not been limited so with certain level settings especially Q overdriven sounds are possible This is great for a nice dirty distorted sound If overdriven sounds are not required simply decrease the Input level or Q level No Sounds There are certain settings that will result in no audio output Apart from the obvious VCA input or output level at zero this may occur when HPF cut off is set very high and LPF cut off set very low This is basically due to ALL the audio being filtered out 7 B mM 989 E PARA M Logxc s ARS INPUT FILTERED FILTERED OUPUT SIGNAL SIGNAL SIGNAL SIGNAL via via INPUT VOLUME LEVEL CONTROL VCALEVEL na Z CUT OFF LL LL 9 2 AUDIO AND CONTRO 9 IGNAL FLOW Input Level This sets the level of the audio signal fed into the audio input Bleed Through The audio input range has not been limited to prevent distortion Overloadin
13. ation All the signal and voltage inputs to modules are arranged in columns lettered A to V The signal and voltage outputs from modules are arranged in rows numbered 1 to 22 In the single patch example below the pin shows where and how to connect the LFO1 saw tooth output into the VCO1 Pitch CV input This patch point is at co ordinates F15 905050284200004005 CEES LE LLL ELLA a LE ate ote TES ET ET LTE TT fF d t tebte tebe tete ae 6506 bene 11114 65606 LELEL Stee 244114 14424 D e a a a a EIILILIILILIILI E _ ARS PL er The following page lists all the patch points available and describes their function It is not practical to supply a patch panel that provides every possible signal routing All the major ones have been included The are a number of extra patch points that are only available via front panel jack sock ets Also all the pin patch points are duplicated with front panel jack sockets Grouping The routing points have been groupe
14. d into audio frequency SlGnals e g oscillator outputs mixer inputs filter inputs and CONTROL e g pitch control joystick LFO signals Generally speaking you would only patch Signals to Signals and Controls to Controls However there are some exceptions For example the mixer although designated a Signal mixer can mix control voltages instead but not at the same time the filter cut off control inputs can be modulated with audio frequencies Patch Pins The Vostok comes with 15 resistor patch pins There is also a Shorting type not supplied Shorting This directly links the source to the modulation lit erally direct shorting Resistance This has inbuilt 10K ohm resistance Generally speak ing use the resistance pin but if you run out use the short ing type The shorting type may cause a drop in signal level when patching more that one output to a source In many instances this would not be noticeable or a problem A B mM m 35295 E o COM cuc X dum Patch Pins continued Shorting These have a short handle and are available in many colours not supplied Resistance This has a long handle and is available in black only Spare pins are available separately Caution Insert pins carefully Push in and pull out in a straight line Do not bend Panel Buffering All of the signal and control outputs are buffered and most but not all of the inp
15. d to give a highly retro look very sim ilar to the seventies style LED digital watches The bubble lenses give a bright and clear display of the characters The display Wave 127 allows quick and easy look up of pitch and wave selection The above is an example of a wavetable showing the 256 byte wavs stored in each of the 128 positions within the table The 1st 2 digits display the note name With each note the octave number is also displayed This octave number is applicable to the next 11 semitones The 2nd 2 digits display the wave number in exadecimal base 16 The waves are number 0 to 127 which in the display in hex is 0 to 7F Controls In Detail Transpose This will transpose the pitch in semitones The full 4 octave range of the VCO can be selected and the note is instantly displayed Initial Wave This sets the wave that will play when there is no Wave CV present or when the Wave CV input is OV Use this control to manually select a wave sample to play The wave number is instantly displayed in hexadecimal Bank Select Switch The 256 waves are split into 2 banks of 128 waves To select each bank 7 B mM 732980 B PA m e ge GAUGE AR 77 AT 1 Bank switch to A 0 127 2 Bank switch to B 128 255 Wave CV Level This is an attenuator for the CV input at the Wave CV jack socket This allows you to alter the level of any input signal such as an
16. ects when resonance is used The full range of the joystick is 12V to 12V but this can be reduced using the range con trols The CVs are output from the jacks and are also available at the matrix board The joystick is not centre sprung When the Vostok is laid flat the joystick will stay in the position it is left When the Vostok is vertical the joystick may slowly drop down under the weight of its own knob Controls In Detail Range X This alters the horizontal voltage range from 0 to 12V Range Y This alters the vertical voltage range from 0 to 12V 7 B mM m 2 89 B mc AR 7 AT 78 m Fg E F E F a B f Ls P OE AM DAAA olani BUlKdL TS VC Multimode Filter VCA HPF LPF Inputs Outputs Audio CV Audio 3 5 amp 6 35mm HPF Cut Off CV LPF Cut Off CV VCA CV VCF Controls Controls HPF Cut Off Input Level HPF Q VCA INITIAL Level HPF Input CV Level Volume LPF Cut Off LPF Q LPF Input CV Level Overview This VC filter is a multimode filter with a difference There are separate cut off and resonance controls for both the HPF and the LPF This means you can use the filter as a LPF a HPF or by combining the two you get a BPF When used as a BPF it has the advantage over others in that you have control over the band width and the added advantage of two separ
17. from 1 to 8 if must receive a square wave Ensure the LFO triangle square Level control is pulled out to select square wave Also the Level must be turned up suffiiciently high enough REI A mM m E M ve ELA T7 aT VOSTOK user manual part of the Phobos range by Analogue Solutions web www analoguesolutions com email vostok analoguesolutions com tel fax 44 0 1384 35 36 94 post 56 kingsley road kingswinford dy6 9rx uk 7 B mM m B8 m Sipe 7 Ab ee 2 WX wea A
18. g the input can give a distorted sound that can be creative Simply lower the level if you do not want a distorted input signal When the input level is excessive and distortion is high the audio signal may overload the VCA too so even with zero voltage at the VCA control input some signal bleed through may occur Simply lower the input signal to a lower level no overload HPF CV Level This sets the level of external CV fed into HPF CV input that affects the HPF cut off Set at minimum the external CV has no effect set at maximum the external CV has full effect LPF CV Level This sets the level of external CV fed into LPF CV input that affects the LPF cut off Set at minimum the external CV has no effect set at maximum the external CV has full effect VCA INITIAL Level This sets the initial level of the It applies a voltage to the VCA that opens it up Set to maximum the VCA will pass signals through at full volume like a normal effects processor This would be the normal way of using this control As the control is turned to minimum the level of the VCA decrease finally to zero In this case an external CV must be used to control the VCA level such as an envelope signal HPF Cut Off This control sets the cut off frequency of the HPF As the control is increased more lower frequencies are filtered out only high frequencies are allowed to pass through HPF Q This alters the resonance of the HPF Set to maximum it will
19. he time it takes for the envelope signal to decrease to zero Level At centre position there is no EG output As you turn more clockwise the signal gets higher as it is turned anti clockwise the signal is inverted and gets higher but at a negative invertd volt age Sockets In Detail Trigger In A positive gate or trigger voltage in here will activate the ADSR sequencer EG Out The envelope signal from this socket The Level pot affects the output Special Repeat Function The EGs have repeat functions which are easy to use and add a powerful modulation capa bilitiy When the sustain level is set to zero the repeat function will be active The envelope will repeat re trigger itself so as soon as the envelope finishes its cycle it starts all over gain In this mode the EG becomes an LFO or Oscillator The speed is set by the Attack and Decay time The Release control will have no effect By setting very short times an audio signal will be present Whether the repeat is short giving high frequencies audio signals or slow like an LFO by varying the Attack or Decay times you are changing the wave shape of the output Anything from Saw to Triangle to Reverse Saw wave froms can be created The unique way in which the EG repeat works is that it will only repeat as long as the Gate voltage is at the Trigger input i e the key is held down sustained This is a great bonus compared to other repeating envelopes in that rather than re
20. l important Glide control as standard Range 0 to 10 seconds Pulse Width You can alter the pulse width duty cycle of the square wave Turning this gives a sound similar to chorusing In the centre position a square wave is produced Sawtooth Level This sets the output volume of the sawtooth waveform output Range 0 to 10V Square Level This sets the output volume of the square waveform output Range 0 to 10V Sockets in Detail CV in This socket is the pitch CV control input and is used to control the pitch of the oscillator Range 0 to 10V PW This is a pulse width control CV input CV modulation of this socket will alter the pulse width of the oscillator square wave Range 10 to 10V Sync In This is an oscillator Sync reset input Feed the Sawtooth waveform of another oscillator at full level into here Sawtooth Out This is the audio output for the sawtooth waveform Its level is affected by the sawtooth level pot Range 0 to 10V Square Out This is the audio output for the square waveform Its level is affected by the square level pot Range 0 to 10V REI A mM m E fF M V ve ELA aon Oscillator Sync The familiar and favourite oscillator sync sound is achieved by using two oscillators One is the master oscillator and each time it begins a new wave cycle it will reset the slave oscillator Full details of the ins and outs of osc sync can be fo
21. lter the length of the sequence pattern to one other than 8 steps Step 1 Out It can be used individually to clock other analogue sequencers to trigger analogue percussion modules gate monosynths or clock the S H module The step out is basically a divide by 8 clock divide relative to the clock input signal Any step output normally step one can be used to clock something else 8x slower CV Out If a very high frequency clock pulse is used to step the sequencer in audio frequencies the CV controls can be used as a waveform generator Because of the quantised steps it will sound digital in form unless an external slew rate generator portamento module is used to smooth the waveform 7 B mM m FP a M ve ELA T AR Joystick Controller Outputs Controls X X Range Y Y Range Overview The joystick is a useful device for giving you a versatile method of hands on control of the Vostok The joystick is a high quality unit with a smooth response across its range It is not self centering so its settings can be maintained without having to keep hold of it The joystick can be patched in to control other modules such as LFO speed or filter sweep One really good use is to have X control the LPF cut off and Y control the HPF cut off This way sweeps of both filters can be controlled in different ways to create sepatation bandwidth changes BPF sweeps and vocal eff
22. nd gates but not all at the same time It allows you to bring many signal sources to gether to be sent to another module such as several VCOs into one filter or mix the outputs of two LFOs to create a special combined modulation voltage It has 2 outputs a normal positive output and an inverted output Sockets In Detail Audio Mixer Use this to mix audio in instances where you have many sources you wish to mix to one mono channel e g several VCO sources When mixing audio you would usually use the normal output CV Gate Mixer Several CV sources can be mixed to make a more complex control signal E g mix an LFO with an envelope signal Inverter When the inverted output is used the signal is inverted so it becomes a neg ative signal or a negative signal becomes positive For example put 5V through and you get 5V out The mixer has a 10 to 10V range 7 B mM 35295 A C mc AR 78 m Fg E F E F a B f Ls P OE AM DAAA RII T Split Multiple Inputs Outputs 2x 4 parallel connected sockets Overview This is a device that is a row of jack sockets all wire together in parallel There are two split modules each a row of 4 paralleled sockets Use The main use of a split module is to split signals making it available on more than 1 output
23. ock VCA Level CV Goes to from the EXTERNAL jacks Square wave Sawtooth wave Waveform Ring mod Filter after VCA White noise Positive signal mixer out MIDI Note to CV MIDI controller velocity to CV MIDI Note on off to Gate Sequencer CV Sequncer Gate Joystick left right Joystick up down LFO1 saw reverse saw LFO1 triangle square LFO2 saw reverse saw LFO2 triangle square Envelope 1 Envelope 2 S H output Goes to from the EXTERNAL jacks V We TEMPLATES FOR YOUR USE PLEASE PHOTOCOPY LV ZISMJ L HATAIX PATCH PAWEL TRIYE SHH UAL Gus zc fe E p 1450 r2 BL AL AZ AL ATE 8311 X T SOS0C000000000 OQUODODOQLDODOOo gQOgOocOgddo pia DPG CHO CHO CHO G0
24. orners pieces Complete closed case 274 H x 440 W x 188 D Lid internal depth 50mm enough to leave in most types of patch lead Main Case internal depth 134mm Weight Power 110 230V AC input set at time of ordering Matrix Patch Panel Matrix pin patch panel with a 22x22 connection size The matrix panel gives the patching versatility of a modular without the need for confusing amp front panel interfering patch cables It s the neatest amp most versatile method of creating patches External Patching Matrix panels alone do not allow interfacing with external synthesisers amp signals so the Vostok also provides a full complement of front panel jack socket patch points for additional internal amp external patching amp interfacing The Vostok may at first glance look like an EMS clone but it is not and not intended to be It may share the matrix panel and suitcase style design but that s where the similarities end The Vostok has far more features packing a powerful amount of modular synthesiser power into one small suitcase 7 mM m BE P AIL Full Spec All ciruits are totally analogue with the exception of the MIDI interface amp Wavetable VCO Control Modules MIDI to CV Converter CV1 pitch CV2 controller Gate Accent Legato MIDI Thru channel select manu al trigger Joystick 2 way joystick cont
25. pear at the S H Out socket Controls In Detail S H Slew This adds slew or portamento between each changing voltage held by the S H So as each voltage is sampled the changes in old to new voltage level will be smoothed out Noise Level Alters the noise level Sockets In Detail S H In This is the signal source for the S H Normally the noise output would be used for a random output S H Clock In Each clock or gate pulse will make the S H sample the input signal then hold it till the next clock signal Normally a square wave signal would be fed into here like LFO1 2 square wave output S H Sig Out This is the output from the S H unit Noise Out This is an audio output from the white noise generator This can be fed into the S H signal input for random S H 7 B mM 35298 B F hA I Inputs Reset In Clock In Indicators 8x Step LEDs 7 B mM 8 Step CV and Gate Sequencer Outputs CV Gate Step 1 Clock Through 35295 A C Controls 8 x OV knobs with built in Gate Switch Step Button Range Switch 5 10V Overview Analogue sequencers allow you to programme a set of voltages and trigger events 8 in this case and allow you to step through them by using a clock signal or LFO square wave With each step the next voltage as set by the control is pres ent at the CV output
26. peating indefinately it will only repeat as long as you want it to by controlling the length of the Gate signal One application of this is by setting the repeat function to create an audio signal The output will only produce audio when a Gate signal is present This gives you a gated audio signal effectively an Oscillator through a VCA 7 B mM m FP a M ve ELA S H NOISE Inputs Outputs Controls S H Clock S H Sig S H Slew S H Signal Noise Noise Level Overview The S H has two inputs and one output One input is for the voltage that is to be sampled and the other is for the clock trigger What happens in a S H is that when it detects a voltage signal at its sampling input it holds it for the duration of the clock pulse It doesn t matter if the sampled voltage fluctuates at all during one clock pulse s cycle the output will remain constant until a new clock pulse is received whereupon the output will change in accordance with the sampled voltage This way stepped voltage changes can be created from smoothly changing inputs from EGs or LFOs When used with a noise source random changes can be created Obtaining a stepped random signal using the Sample and Hold Facility To create a stepped random voltage Patch a square wave LFO output into the S H Clock input the Noise output to the S H Signal input Turn the Noise level up The S H output signal will ap
27. r the modules for any reason whatsoever Plug them in correctly otherwise they will blow Power The Vostok requires 230V AC Europe or 110V AC USA Order the correct version for your mains supply Be sure to use the correct mains supply for your Vostok The IEC inlet is double fused and filtered Insert the power lead into the socket Flick the switch towards the front panel to turn the Vostok on Always turn the power switch off and disconnect the mains lead when the Vostok is not in use Top Cover The cover is attached via 2 hinges and 2 catches To remove the cover release the catches Open up the cover far enough so it can be lifted off the hinges When closing the cover ensure it is correctly lined up with the main case before shutting catches If you are leaving patch cables in the synth ensure the moulded plugs are not too long to fit the cover Also ensure no cables are caught in the sides when shutting Using The Vostok can be laid flat horizontally or upright vertically It has rubber feet on both surfaces 7 T mM m p 0 B OA E f O T m E F M PUN 5 DAAA T rz rr Patching The Vostok uses patch pins to make connections in the patch panel To make a connection between two modules a pin must be inserted in the pin hole lining up with module source des tin
28. rix Patch Panel Utilises a patch panel with 22x22 connections The patching versatility of a modular with out the need for confusing amp front panel interfering patch cables Pins supplied are 10K resistance type Lead Patching Jack socket patch points provided for additional internal amp external patching amp interfac ing LEDs 13 of them 4x7 segment wavetable display Case Portable suitcase with chrome catches carry handle amp lift off front panel Safety Instructions Please read carefully before using Only use the recommended power 230V Europe 110V USA AC Never handle the power adaptor with wet hands Never excessivly bend the adaptor cable or get it trapped or place heavy objects on it If the adaptor cable becomes damaged replace the adaptor Ensure the unit is disconnected from the mains before moving or cleaning Always disconnect the unit from the mains if there is lightning in your area Ensure the unit is on a stable surface and never place heavy objects on top of it Never allow young children to operate the unit or power adaptor Do not use excessive force when using the controls or inserting cables to the connec tors The unit should not be operated in the rain or near water and should not be exposed to moisture If the unit is brought from a cold environment to a warm one the unit should be left to reach the ambient temperature This is to allow any possible condensation mois
29. roller Sequencer 8 step CV amp Gate analogue sequencer range switch manual step Audio Modules VCO1 Saw Square waves Pulse Width Glide Sync VCO2 Saw Square waves Pulse Width Glide Sync VCO3 Digital wavetable oscillator 256 waveforms Digital readout display Noise White noise source Voltage Controlled Multimode Filter 2 Filters based on Korg MS20 circuitry Independent Cut Off and Resonance for Low Pass Filters and High Pass Filters The VCLPF and VCHPF combine to produce a 3rd filter type Band Pass Voltage Controlled Amplifier VCA wired in series with the VCF output With 1 4 jack audio output Ring Modulator AC ring mod CV Modules EG 1 ADSR envelope generator Norla Inverse output Repeat function EG2 ADSR envelope generator Normal Inverse output Repeat function VCLFO1 Ramp Reverse Ramp Square Triangle waves Voltage controlled frequency VCLFO2 Ramp Reverse Ramp Square Triangle waves Voltage controlled frequency Sample and Hold S H with Slew Utility Modules Mixer CV Audio Mixer 6 input with Normal and Inverse output Signal Meter The meter input is taken from the Mixer output It is back lit Split 1 and 2 2 multiples each is 4 way Adaptor 6 35mm 3 5mm jack socket converters External Adaptor 2 6 35mm 3 5mm jack socket converter wired into the matrix board Power Internal filtered mains transformer IEC lead connection double fused neon lit power switch Mat
30. s not possible to produce high pitch LEV notes VCO3 is more suited to bass and mid bass ranges and sound effects Some of the waves are doubled to produce higher octaves This is not unique to this VCO Other wavetable oscillators made by several other modu lar synth manufacturerers also have a restriction on upper pitch range VCO3 works best when used with the internal analogue sequencer 4 M gt 7 B mM 35295 A C mc AR a ARS Wavetables Wavetables are a method of sound generation used by such classic synths as the PPG Wave Single cycles of waveforms xu Wave 000 waves are captured in digital memory and stored in a wave table The waves in the wavetable will loop continuously but at any time a different wave can be selected By changing the gy Wave 001 wave different tones can be created e The wave can be selected by an external control voltage Sue 7 Wave 002 This means that by using an LFO or EG signal the wavetable can be swept stepping through each wave sample in turn for dramatic tone effects Waves Each wave is stored as 256 8 bit bytes There are 2 banks of 128 waves giving a total of 256 wave samples The wavetable is stored on EPROM with a total memory of 64K bytes Wave 125 d Wave 126 Display The VCO has 4 character bubble type LED display This has been carefully selecte
31. scale de flection Keep the movement within its range Accuracy Please note this is not a precision voltage measuring device The price of the Vostok would leap up for this to be a precision device A mM m 2 89 B mc AR mn Gm Trouble Shooting VCO1 or VCO2 seem to be transposed to a higher or lower range If you un patch a CV from one of the analogue VCOs pitch CV inputs they will remember the last voltage they received and this will offset the Tune control This will be over ridden when a new CV is patch to the analogue VCO pitch CVs VCO3 seems to play the wrong note when patch to the MIDI CV converter The Tune control of the VCO3 adds to the note coming in on VCO3 s pitch CV input It acts as a transpose control When controlling VCO3 s pitch from a CV you must turn the Transpose control to minimum The EGs are acting strange They both have a repeat function To oppurate them the sustain must be at a very low set ting and there must be a gate signal triggering the envelope The EG will repeat as long as the gate is present The repeat time and output waveform can be changed with the Attack and Decay time If very short settings are made an audio waveform will be present To eliminate the repeat function increase the Sustain level until there is no more repeat cannot get the Sequencer to clock in order For the sequencer to run in order
32. self oscillate producing a con tinuous sinewave In this way the filter can be used as a simple VCO LPF Cut Off This control sets the cut off frequency of the LPF As the control is increased more higher 7 mM m hE A oue eR A mn AT frequencies are filtered out only low frequencies are allowed to pass through LPF Q This alters the resonance of the LPF Set to maximum it will self oscillate producing a con tinuous sinewave In this way the filter can be used as a simple VCO Volume This sets the final output volume of the filter VCA 7 B mM m FP a M ve ELA T ABD Ring Mod Inputs Outputs X Ring Mod Y Overview The ring modulator is a popular kind of audio effect It requires two audio sources The best sources to use on the Vostok are two of the oscillator outputs Sockets In Detail X This is one of the two ring mod inputs This is one of the two ring mod inputs Ring Mod This is the output from the ring mod 7 B mM m 2 89 B yc eR ANNAN J J Inputs 6x ins 6 Input Audio CV Gate Mixer with Inverter Ouputs 3 5mm out normal 3 5mm out inverted Overview The mixer is a 6 input unity gain mixer It can mix audio control voltages a
33. socket For example to make the output of an envelope which only has one output socket available to lots of inputs Plug the EG output into the split then the three remaining split sockets will also carry that EG signal A splitter can be used as a simple passive audio mixer but there may be problems of impedance and level matching It can also be used in some instances to mix control voltages but this again depends on the design of the modules When a signal is split by a passive device such as the splitter the 22 output power and possibly the level will be reduced Adaptor External Inputs Outputs 3 5mm wired to a 6 35mm socket Overview The Adaptor is 2 different socket sizes wired together to allow conversion from a 3 5mm plug to a 6 35mm plug or vice versa This allows you to plug a line level signal from for example a digital synthesiser that uses a large jack plug to be plugged into the Vostok s minijack system The External connectors are the same as the Adaptor except that the Ex ternal sockets are also wired to the Input and Output matrix board points labelled External This allows external signals to be patch within the matrix board 7 T5 B mM m 32098 O mc AR a AER Signal Meter Controls Indicators Range Moving Coil Backlit Merl 5 1 i FROM B E MZ Overview 2 S 7 Y RANGE The meter is a moving coil meter as found on some clas
34. t to select Reverse Ramp Triangle Square Level Select Switch Sets the output level to the Triangle out jack of the Triangle signal This control has a built in push pull switch Pull the control out to select Square Sockets In Detail Ramp Reverse Ramp Outputs the Ramp or Rev Ramp signal depending which is selected Range 0 to 10V Triangle Square Outputs the Triangle or Square signal depending which is selected Range 0 to 10V Frequency CV In This is a control voltage input The level of the input voltage controls the speed of the LFO This is good for creating even more interesting LFO effects Feed the output of the envelope into here for an LFO speed that changes over time Or use the CV sequencer to change the speed on each beat Range 0 to 10V 7 B mM m 32098 O mc AR a AS Inputs Trig In Controls Attack Decay Sustain Release Level A E aa Controls In Detail Attack Envelope Generators 1 amp 2 Outputs Indicators EG Trig LEDs Envelope Generators EGs in general The EG produces a CV that varies over a period of time It s start is triggered by a Gate or Trigger signal The main use for an EG is to vary the volume of a sound when used to control a VCA to reproduce the way natural instruments sound E g a piano sound starting loud when the key is struck then gradu
35. ture inside the unit to evapourate Although any built up moisture will not damage the unit any shorting may be hazardous Never open the case or attempt to make repairs Refer any servicing to a qualified service personnel Do not eat Do not use the unit in a manor that is likely to cause offence A LE m hE g I The Case The Vostok case has been designed to be compact and portable It is made from durable HIPS material has reinforced corner pieces strong catches and hinges The handle mounting is reinforce However the case does not have full flight case strength If you wish to transport the unit via courier freight and other delivery services like all other delicate musical instruments it must be packed well ideally in a foam lined full flight case For those buying the case without the Vostok synth The empty case when supplied on its own is model number 516005 The power supply board supplies 12V and 5V There are 9 A100 style connectors and 2 Integrator sockets The case will accept Concussor A100 and Integrator modules Maximum module depth top row 125mm bottom row 85mm The width is 85HP which is 1 more than other cases When the case is supplied on its own it comes with 4 lipped tie bars When supplied with a Vostok mounted it comes with 3 lipless tie bars When fitting your own modules no guarantee can be provided fo
36. und various web resources To get this feature working on the VCO e patch a master VCO s sawtooth set it at full level waveform out into a slave VCO s Sync In Take your audio out from the slave VCO this is where your sync sound will be To control theSync effect alter the pitch of the master VCO Note itis important to balance the relative pitches of the 2 oscillators to get an effective sound With certain settings you may not get an effect or even any audio 7 B mM m FP a M c a 4 T 4m Voltage Controlled Wavetable Oscillator VCO3 Inputs Outputs Switches Pitch CV Audio Bank Selec Wave CV Bank CV Indicators Pitch Wave Display 4x 7 segment watch style LED Controls Wavetable Transpose 256 waves samples 256bytes x 8 bit 64K total memory Initial Wave Wave CV Level Volume Overview VCO3 is an 8 bit digital wavetable oscillator under volt age control It can be used in place of an analogue VCO to be your initial sound source for subsequenct processing VCO3 has 2 advantages over analogue VCOs They always hold perfect tuning and it provides a total of 256 dif ferent waveforms It also quantises the Pitch CV input so it will play the nearest semitone This makes setting up your analogue sequencer to play melodies in tune far easier than analogue VCOs Note Without expensive DSP design which VCO3 does not employ it i
37. uts are buff ered This means when used with the resistance pins there should be little or no signal change when inserting more than 1 pin in any row or column Please note we will choose which colours to send with the unit depending on what colours we have in stock at that time REI A mM 3B fF M cm Xv eR P unm Columns Inputs Audio Frequency Signal Inputs A VCO2 Sync B RM X C RM Y D FILTER E MIXER Control Voltage Signal Inputs F VCO1 OV G VCO2 CV H VCO3 CV VCO1 PW J VCO3 WAVE K HPF CUTOFF L LPF CUTOFF M SQ CLOCK N SQ RESET LFO1 FREQ P LFO2 FREQ Q EG1 TRIG R EG2 TRIG S S H SIG T 5 CLOCK U VCALEVEL V EXTERNAL Rows Outputs Audio Frequency Signal Outputs 1 VCO1 SQUARE 2 VCO2 SAW 3 VCO3 4 RING MOD 5 FILTER 6 NOISE 7 MIXER Control Voltage Signal Outputs 8 MIDI CV1 9 MIDI CV2 10 MIDI GATE 11 SQ 12 SQ GATE 13 STICK X 14 STICK Y 15 LFO1 SAW 16 LFO1 TRI SQ 17 LFO2 SAW 18 LFO2 TRI SQ 19 EG1 20 EG2 21 S H 22 EXTERNAL Waveform reset Ring mod input Ring mod input Filter signal input Mixer input can mix CVs too Pitch control Pitch control Pitch control Pulse width Wave select Cut off frequency Cut off frequency Sequencer clock Sequencer reset to 1 Frequency CV control Frequency CV control Trigger Trigger Sample and Hold CV signal in Sample and Hold cl
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