Liivatera - Through-Zero VCO


Nifty analog oscillator with triangle-core design – The Through-Zero VCO is an extremely versatile sound source. It comes equipped with seven audio outputs. Besides standards, there are connectors emitting a half-frequency square wave and a double-frequency sawtooth. For playing the circuit, conducting transpositions and so forth, a total of three CV inputs is available. One of them features an attenuator. Furthermore, the oscillator offers a linear FM input, which can be edited in its sensitivity. The Through-Zero VCO's sync channel is equipped with a threshold parameter and trigger options. Pitch and pulse width potentiometers plus a PWM input complete the module's functional range.

The Through-Zero VCO shines with classic, analog sound, which can be twisted in a multitude of directions. Especially the thick, very musical results of linear frequency modulations are quite impressive.



The Through-Zero VCO features seven audio outputs. In detail, the following waveforms are available:

  • Sine
  • Triangle
  • Sawtooth
  • Double-frequency sawtooth
  • Pulse
  • Square
  • Half-frequency square

The oscillator's pitch is adjustable via coarse and fine tune potentiometers. For playing the module and conducting transpositions, there are two 1v/octave connectors. Additionally, an exponential input with attenuator and a linear FM channel were implemented. The latter comes equipped with a three way switch to determine its sensitivity. A cutoff at 3 Hz guards against unintentional detuning.

The Through-Zero VCO's sync path features a threshold parameter, which can be influenced via a potentiometer and a CV input. Furthermore, the user is able to decide whether the sync function gets activated at rising and / or falling edges of incoming signals.

The pulse width can be adjusted in the range of 0 % to 100 %. For modulations, there is a PWM control voltage input. The VCO/LFO switch allows users to lower the oscillator's frequency by a factor of 100.


Frequency range in VCO mode : 12 Hz to 18 kHz
Frequency range in LFO mode: 0,1 Hz to 180 Hz


1V/octave and two (exponential) CV inputs
Linear FM input
Sync input
(Sync) threshold and PWM inputs
Seven waveform outputs


3U Eurorack module, 14 HP wide, 22 mm in depth
Power consumption: 65 mA at +12 V and 60 mA at -12 V

0.2 kg
Article Number

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