Stoev modules for VCV Rack

Stoev is a collection of virtual Eurorack modules. Each module is designed like a physical device, and as a part of a composition/performance system. Currently released modules include:

Get the Stoev modules from the VCV Library.


Interference is a poly rhythm generator module based on wave motion. It can generate up to eight separate but interrelated rhythms, providing a wide range of rhythmic patterns – from very simple to very complex. Use it as a trigger sequencer, a clock generator, a clock divider, or all this at the same time. Even try it as a sound source.

Stoev Interference Eurorack module

Main controls

PLAY button and CV input – start/stop the sequence.
Tempo knob and TEMPO CV input – set the speed of the sequence in BPM.
EXT CV input – an external clock input. Sets the speed of the sequence, bypassing the internal tempo.
Tempo indicator – flashes at the current tempo.
RESET button and CV input – reset the sequence.

A, B, C, and D

Four separate rhythm generators. Each has a:

  • Period knob and CV input – set the period of the rhythm generator relative to the tempo. The CV input expects 0.5 V/division, offset by the knob.
  • On/off button – turns the rhythm generator on/off.
  • Trigger output – a separate output for the rhythm generator.

Trigger outputs

CLOCK – outputs a steady rhythm at the current tempo.
R – the primary sequence. Outputs a rhythm generated by the active rhythm generators.
R’ – the secondary sequence. Outputs a rhythm complementary to R.
ACCENT – outputs a steady rhythm at each repetition of R (and R’), marking the beginning of the sequence.


When only two rhythm generators are active R and R’ are the same.

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Projection is a dual geometrical sequencer / CV recorder module based on geometric transformations. It can generate two variable-length sequences, chain and transform them in several ways, producing new musical material. It can also record two CVs and do the same with them. Use it as a sequencer, a CV recorder/looper, a stepped modulation source, or a sample and hold. Even try it as a wavetable oscillator.

Stoev Projection Eurorack module

A and B

Two independent 8-step sequencers / CV recorders. Each has:

  • Step buttons – activate/deactivate the corresponding step. Use them to change the length of the sequence.
  • Step sliders – set the voltage level for the corresponding step. Also, use them to offset the recorded voltage for each step. Blue light indicates the current step.
  • CV input – connect a signal for recording here. Also, use it to offset the step sliders’ voltage levels.
  • GATE input – advances the sequence by one step when a gate/trigger is received.
  • RESET input – resets the sequence.
  • REC button and CV input – start/stop recording. During recording, the REC button is lit in red. After recording, light red color indicates that a recording has been made. Hold the button or send a high gate signal for at least one second to clean the recording.
  • RANGE button – scales the CV output. There are four possible ranges: +/-1 V, +/-2 V, +/-5 V, and +/-10 V. The brightness of the light indicates the selected range.
  • CV output – the main output – a mix of the step sliders’ voltage levels and the recorded voltages.
  • GATE output – passes the signal at the GATE input.

Common controls

CHAIN button – chains A and B. When A and B are chained, Projection turns into a 16-step sequencer / CV recorder. A’s inputs take control, B’s inputs are ignored. A’s outputs are duplicated to B’s outputs, effectively providing a second pair of outputs.
QUADRANT buttons and QUAD CV input – transform the sequences/recordings by geometric reflection. To visualize the result, imagine a sequence that is situated on a plane with two axes – x and y. The x-axis represents the steps and the y-axis represents the voltages of the sequence. The two axes divide the plane into four regions – the quadrants. Reflection over the y-axis inverts the playback direction. Reflection over the x-axis inverts the voltage polarity. Green light indicates the active quadrant, faint green – which button is pressed if it is different from the active quadrant (when you use the QUAD CV input).

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Symmetry is a dual quantizer/arpeggiator module based on symmetric distribution of pitch. It has ten different scale types and pitch selection or randomization options providing a vast range of scales*. Use it as a quantizer, an arpeggiator, an interval generator, or a stepped random voltage generator. Even try it as a digital noise source.

Stoev Symmetry Eurorack module

Main controls

TYPE knob and CV input – set the type of scale*.
Pitch-unit buttons – set the pitches of the scale*. Starting with a root at the 12 o’clock position each consecutive button in clockwise direction is one semitone above the previous one.
RANDOM button and RAND CV input – randomize the pitches of the scale.
AXIS knob and CV input – transpose the CV outputs in steps of one semitone. Range of +/-12 semitones.
INTERVAL knob and CV input – offset the CV output of section B in steps of one semitone. Range of +/-12 semitones.
ƒ button – changes the function of the < and > buttons.
< and > buttons – when the light of the ƒ button is off, the < and > buttons set the tonal expansion or contraction of the scale*. On each button press the scale is expanded or contracted one more time. Faint green light indicates that there are no more expansions or contractions available for the scale. When the ƒ button is lit in red, the < and > buttons set the arpeggiator mode. Green light indicates the active mode: > – up, < – down, <> – up/down, off – random.

A and B

Two sections sharing a common scale. Each has a:

  • CV input – the main input. Connect a signal for quantization here.
  • TRIG input – when Symmetry is used as a quantizer and the TRIG input is connected, the input signal is quantized only when a trigger/gate is received. If the TRIG input is not connected, the input signal is quantized continuously. When Symmetry is used as an arpeggiator, the next pitch is output only when a trigger/gate is received.
  • CV output – the main output.
  • TRIG output – when Symmetry is used as a quantizer, outputs a trigger each time the input signal is quantized to a new scale degree. When Symmetry is used as an arpeggiator or when “Triggers pass through” is activated (from the context menu), outputs a trigger each time a trigger/gate is received at the TRIG input.


When the inputs of section B are not connected, its outputs mirror the outputs of section A.

* See the Symmetry scales guide for details.

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