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Additive Synth


  • • Sound capabilities tailored for experiments
  • • Alias free sound quality
  • • Visual feedback of the sound spectrum

Video clips

Audio examples

Noxious is a polyphonic additive synthesizer. Additive synthesis consists of adding tens, hundreds or thousands of individual sinusoidal oscillators to create complex waveforms or sounds. In theory, additive synthesis is able to recreate any sound imaginable but is usually a challenge to manipulate. Noxious takes an intermediate route to additive synthesis by offering a limited mean of manipulating these sinusoidal oscillators, called partials, through “modifiers” and classical filters.

Noxious is also available in a bundle with Oberon and LeSpace.

Product details

Noxious hides away much of the complexity of additive synthesis and is fairly intuitive if you are used to subtractive synthesis and forget all the "partial modifier" part. Without all this, you still get an alias free subtractive synth with filter slopes ranging from 6 to 48 dB/octave. But if you start to delve in the modifier stack, things start to get really interesting. Twist your sound spectrum in ways unimaginable with classic synthesis and use the spectrum display to keep track of things.

  • Waveforms - Instead of creating partials from scratch, Noxious will allow you to start with a basic wave form from a predetermined list. These wave forms are not purely periodic, which is what you find in most synthesizers. Noxious can produce inharmonic wave forms. Being an additive synthesizer Noxious can generate up to 200 partials or sine oscillators per wave form.

  • Modifiers - These partials produced by the additive engine can then be transformed by a stack of up to five modifiers. The modifiers are applied in sequence and can modify the levels of the partials, their pitch or both. Each modifier can operate on a subset of partials. Modifiers range from equalizers, to tuners or even pure random noise.

  • Filters - After the partial modifiers, the wave form can be modified furthermore with two multi-state filters in series featuring resonance. This is classical territory if you know subtractive synthesis but the filters operate directly on the partials without touching the phase. Your typical low pass, high pass and band pass filters come in four flavors : 6, 12, 24 and 48 dB/octave slopes.

  • Modulation - And because static sounds are so boring, all the above filters and modifiers can be furthermore modulated with two LFOs, two modulation envelopes, amplitude envelope and performance controllers such as velocity, aftertouch or modulation wheel. A modulation matrix lets you build your own modulation routes with adjustable modulation strength.

And if that isn’t enough, control voltage signals can be used to modulate sections of Noxious from external devices thanks to Reason’s powerful cable system.

Documentation is available in english and PDF format at this link:

Unless otherwise stated all sounds of the demo tracks are made with Noxious, except drums and vocals.


This version adds some more filter, modifier and wave types as well as modulation destinations like envelope decay and realase. - New filters : band reject and low pass type II from 6 dB/oct to 48 dB/oct. - New modifiers : duplicate, level randomize, pitch randomize and limit - New waves : shepard, fractal, quasi-sawtooth and alien. Also, more than 40 new patches (including combinator patches) are added to the preset list.


This version introduces major performance enhancements as well as some new features: - True stereo width - Vowel filter. - Parallel filter mode - Waveform variations - Random on note modulation source. An extra ~40 new patches are also included.


Apart from minor bug fixes, this version adds 74 new patches, including device and combinator patches from Nucleus Soundlab.


Fixes a bug with LFO 1 & 2 CV outputs which had double the frequency of the internal LFOs. Also adds a dozen new patches.


Corrects a small typo on the front panel and adds a handfull of new patches.


Corrects a bug with the partial display and adds some more patches.


Corrects a potential crash when crossbrowsing to Noxious while playing legato notes and adds some more patches.


Fixed a bug when re-striking same note while using sustain pedal.


Support for Blamsoft's PolyCV polyphonic CV protocol.



Released: 2016-07-04
Version: 1.6.0