Vermona fourMulator Quad LFO


With fourMulator Vermona created a digital quad-LFO-module for the Eurorack-modular standard offering a lot more than typical cyclic modulations. With the individual modulators’ (LFOs) ability to sync to a common master clock, you are able to both create individual sound movements or complex and rhythmical modulation structures.

Functions: Clock Generator , LFO , Quad
Height: 3U
Width: 34hp

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Vermona fourMulator - Quad modulation and trigger engine

Do you really need four LFO units in a single module? You cannot really have enough LFOs, can you? Even a classic synthesizer easily offers four targets for LFO modulations. To name a few: vibrato, pulse width, the filter’s cutoff frequency and tremolo. In a modular synthesizer there are even significantly more options. Now add the options deriving from a combination of multiple LFOs to create interaction between the units to make these applications more thrilling.

Vermon's fourMulator is a Quad-LFO with rich feature-set. Its four sync-able, phase-variable and CVcontrollable LFOs are able to create trigger-sequences that can be varied in real time thanks to a comfortable user interface. fourMulator acts as a modulation as well as clock-central and is capable of being your new clockreference for your modular synthesizer.

The modulators
Every LFO offers a choice of six wave forms: ascending or descending saw tooth, square, triangle, sine and a random curve (Sample & Hold). These oscillate in frequencies between 0.05Hz (20 seconds) and approximately 100Hz – fast enough for sonic alienation of oscillators, filters and VCAs. Each modulator offers individual wave-form- and trigger-outputs. The latter output a trigger impulse with every restart of the wave form. In addition, individual reset- and CV-inputs allow adding further manipulations from externally or within fourMulator.


  • The four modulator sections work independently generally, but may be synchronized to a clock-signal.
  • Two or more synchronized modulators oscillate at the same frequency, but not necessarily at identical phase. A synced modulator may be shifted by up to 180° – a half-cycle - to its neighbor. This way, you may easily create counter-rotating modulations. And by using the CV-inputs for phase modulation, even more complex structures become possible.
  • When being synchronized to a clock, the modulators oscillate with defined but adjustable clock divisions to the reference. Here too, being able to modulate the dividers by a control-voltage, highest-level versatility is guaranteed.
  • Both sync-modes can finally be combined. This way, you may synchronize one modulator to a reference clock, while it simultaneously serves as a master for its right neighbor.
CLOCK generator (CLK)
fourMulator has a clock-generator integrated. Its tempo can be set by using the TAP-button but also by using an external clock reference.


  • Frequency range: 0.05 Hz .. 100 Hz
  • Control elements: WAVE, SPEED, SYNC
  • WAVE outputs: -5 V .. +5 V
  • TRIGGER outputs: +12 V, 10 ms
  • CV inputs: -5 .. +5 V
  • RESET inputs: min. +3.5 V, max. +12 V

Clock-Generator (CLK)

  • Control elements: TAP button
  • CLK OUT output: +12 V, 10 ms
  • CLK IN input: min. +3.5 V, max. +12 V

Further connectors

  • TRIG SEQ output: +12 V, 10 ms
  • RESET Eingang: min. +3.5 V, max. +12 V

Power Consumtion

  • +12 V: 120 mA
  • -12 V: 10 mA

Dimensions / Weight

  • Width / Height: 34 HP (ca. 173 mm) / 3 U
  • Depth: 25 mm
  • Weight: 365 g

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