Synthrotek is pleased to offer a complete line of eurorack synthesizer modules, power, cases and accessories in both complete units kits and panels & pcbs. We now offer a very complete analog modular monophonic voice with many accompanying utility modules. This new complete voice is the product of a collaboration with synth guru George Mattson, who now joins us in releasing our new MST (Mattson – Synthrotek) line of premium modules.

MST - VC Low Frequency Oscillator

MST – VC Low Frequency Oscillator

MST Voltage Controlled Low Frequency Oscillator is another tiny, useful module packed to the gills with features.  Manual and CV control over rate with 3 discrete waveform outputs.  A square wave can be used to clock modules such as our Noise, Sample & Hold module. Great for creating vibrato, tremolo or other classic modulation techniques.  Great for frequency modulation, especially when connected to the MST analog VCO.


Voltage Control rate input with attenuator control

Manual rate control

Slew/Symmetry control

Positive and negative LED indicators

Square, triangle and sine wave outputs


Output CV: +5v to -5v

Manual range: Approx 51 Seconds to Approx 102 Hz

Time with Max range, +5V CV: 1,450Hz

Time with Max range, -5V CV: 1 Hz

Time with Min range, +5V CV: 2 Hz

Time with Min range, -5V CV:  1.5 Hours

Skew range, all waveforms: 14% to 86%

Current draw: V+ max 11.75mA, V- max 12.2mA

Width: 4HP, Depth: 4.77 cm (1.88 in)


  1. Li says:

    is C2 10nF the timing cap for the oscillator?

  2. Patrick Kelly says:

    Correct, thats the cap that controls timing.

  3. Chan says:

    Hi – is the Symmetry knob for controlling the waveshape/pulse width? And is the knob bi-polar – CCW = left slope shape, CW = right slope shape? Thanks a lot!

  4. Steve Harmon says:

    Hey Chan,

    The symmetry knob will change the shape each waveform. When set to 12:00, the waveform will be symmetrical. Turning it CCW will change the falling slope of the wave and turning it CW will change the rising slope. This is only true for the sine and triangle waves. The square wave out is a bit different. The symmetry knob controls the falling pulse making the wave longer as you turn it CW and shorter as you turn it CCW.

    Thanks for your question!

  5. jenz says:

    Just finished building this kit and it works but the sine is +4/-5volts triangle is +3/-4 volts and square is +4/-5volts. Normal? I use de Volt Meter from Division 6.

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