Synth (Semi Modular) by KV331 Audio
SynthMaster SynthMaster SynthMaster SynthMaster SynthMaster SynthMaster SynthMaster SynthMaster SynthMaster SynthMaster
What is it?
Operating System Availability
Operating System Latest Version
System Requirements
CPU: 2 Ghz (SSE3)
OS: Windows 7 and above
AAX: ProTools 11 and above
System Requirements
CPU: 2 Ghz (SSE3)
OS: Mac OS X 10.7 and above
AAX: ProTools 11 and above
License & Installation Method
Voucher / Code for redemption on other website
What does this mean?
For related news items, downloads and more please see the full KVR product page for

SynthMaster is an 'all-round' semi-modular software synthesizer and effect plug-in that features many different synthesis methods including VA, Additive, Wavetable, Phase Modulation, Phase Distortion, Frequency Modulation, Pulse Width Modulation, Ring Modulation, Amplitude Modulation, Physical Modeling and SFZ Sample Playback synthesis.

With its multi-synthesis oscillators, analog modelled/digital filters, flexible effects routing with 11 types of high quality effects and a massive modulation architecture with 95 separate modulation sources and 650+ modulation targets, SynthMaster is a powerful instrument for all synthesizer enthusiasts.


  • Cross-platform VST/AU/AAX: SynthMaster runs as a VST/AAX instrument/effect on both Windows and Mac OS X, and as a VST/AU/AAX instrument/effect on Mac OS X.
  • 1800 Factory Presets: SynthMaster comes with 1800 factory presets from a world class team of sound designers: Arksun, BigTone, Kevin Schroeder, Michael Kastrup, Rob Lee, Nori Ubukata, Ufuk Kevser, Fragment Audio, Gercek Dorman, VorpalSound, Vandalism, BluffMonkey, Ümit 'Insigna' Uy, Aiyn Zahev, Frank 'Xenox' Neumann, Teoman Pasinlioglu and Brian 'Xenos' Lee.
  • Semi-Modular Architecture: For each SynthMaster instance, there are 2 layers followed by 2 global effect send buses. Each layer has its own: Arpeggiator, 2 Oscillators, 4 Modulators, 2 Filters, 4 ADSR Envelopes, 2 Multistage Envelopes, 2 2D Envelopes, 2 LFOs and 4 Keyscalers. The modulators can modulate frequency, phase, amplitude or pulse width of the oscillators or any other modulators at audio rate, or they can be used as sub-oscillators.
  • Massive Modulation Architecture: SynthMaster has more than 650 modulation targets and 95 modulation sources including ADSR Envelopes, 2D Envelopes, Multistage Envelopes, LFOs, KeyScalers, Easy Parameters, Vocoder Bands, MIDI Velocity, Aftertouch, Pitch Bend and MIDI CC. Each modulation target can have up to 3 modulation sources. The modulation matrix, which has 64 available slots, has visual filtering as well so that targets for a specific source, or sources for a specific target can be filtered and shown on the user interface.
  • Easy Parameters: SynthMaster features 8 easy knobs and 2 XY pads that can be freely assigned as modulation sources, so that the complexity of the synth engine could be hidden away and only most important parameters of a preset can be controlled by the user. The easy parameters can be globally linked to MIDI controllers, and they can be assigned automatically by SynthMaster as well.
  • Powerful Arpeggiator: The arpeggiator in SynthMaster features classic arpeggiator modes such as Up, Down, UpDown, DownUp, UpDown2, DownUp2, AsPlayed as well as Sequence, Chord, Arpeggiate and DrumKit modes. Each of the 32 steps of the arpeggiator has its own Velocity, Note Number, Note Length, Slide and Hold parameters.
  • Basic Oscillators: 'Basic' oscillators in SynthMaster are capable of synthesizing many different types of waveforms: Sine, Square, Triangle, Sawtooth, Pulse, Noise, any single cycle waveforms and multi-sampled WAV/AIFFs defined in SFZ files.
  • Additive Oscillators: An 'Additive' oscillator is actually 8 'basic' oscillators running together. Each 'basic' oscillator has its own detune, tone, phase/pulse width, frequency and waveform type.
  • Vector Oscillators: A 'Vector' oscillator consists of 4 'basic' oscillators, mixed at different ratios. The mix ratios are determined by 2 orthogonal parameters in 2 dimensions: 'X Index' and 'Y index'.
  • Wavetable Oscillators: A 'Wavetable' oscillator is similar to basic oscillator, except that the waveform can be scanned (interpolated) through up to 16 different waveforms shapes. The position of the waveform can be adjusted using the 'wave index' parameter.
  • Stereo Oscillators with Improved Unison: Oscillators in SynthMaster have stereo output. With the "voices", "voices mix", "pan spread", "detune spread" and "detune curve" parameters, each basic/wavetable oscillator can have its own unison settings which eliminates the need to enable unison for all voice elements.
  • Analog Filters: The 'analog' filters are modelled after the famous ladder filter, so they self oscillate when the filter resonance is maxed out. They have continuously variable slope, which is unique to SynthMaster. There are 3 CPU settings for analog filters: "Basic", "Normal" and "High". With the "Basic" setting, CPU can be reduced by at least 50%.
  • Digital Filters: The 'digital' filters are biquad filters with a hard limiter in their output. The limiter features an envelope follower with attack, release and threshold parameters.
  • Multimode Filters: With the new 'multimode' filter type, it is possible to switch from Lowpass to Bandpass to Highpass filter types continuously. For analog multimode filters, it is also possible to change the slope of the filter continuously from 0 db/oct to 24 db/oct.
  • Dual Filters: With the new 'dual' filter type, two multimode filters can be run simultaneously, either in parallel, or in series. The mix ratios between the filters, and the topology (parallel/series) between them can be changed continuously, as well as the modes and cutoff frequencies of the filters.
  • Comb Filters: Comb filters are digital filters used in physical modeling synthesis.
  • Before/Inside/After Filter Distortion: A distortion stage can be inserted before, after, or even inside the filters. For analog filters, the distortion is applied for each of the 4 filter stages in 'inside' mode.
  • Rich Set of Effects: SynthMaster features 11 different effect types: Distortion, LoFi, Ensemble, Phaser, 6 Band EQ, Compressor, Vocoder, Delay, Chorus, Tremolo, Reverb.
  • Flexible Effects Routing: Each of the 11 effect types can be inserted on any layer insert or on any of the 2 global effect bus inserts.
  • Microtuning: SynthMaster supports Scala tuning, so tuning can be set either for each preset or globally by loading from a Scala tuning file.
  • Preset Browser: SynthMaster features a comprehensive preset browser with separate search criteria for instrument type, preset attributes, music style or preset author.
  • Online Preset Browser: Registered users can upload their presets to the online preset library, or browse and download presets created by other registered users; using the preset browser right inside the plug-in window.
  • Multiple Skins: SynthMaster comes with 3 different skins in different color variations. Using the included user interface editor, users can not only customize the existing skins but also can create their own custom interfaces as well.
  • Import of MIDI patterns as Arpeggiator Sequence: Monophonic or even polyphonic (chord) MIDI patterns can be imported into the arpeggiators in SynthMaster by just drag and drop of the MIDI file onto the arpeggiator view on the plug-in window.
  • Import of WAV/AIFF Multisamples as SFZ definitions: Multisamples in WAV/AIFF formats could be imported into SynthMaster as SFZ definitions, by simply drag and drop of the WAV/AIFF files onto the oscillator waveform view on the plug-in window.

A demo version of SynthMaster is available. It is identical to the standard version except for 3 limitations:

  1. Saving presets is disabled.
  2. The synth starts playing random notes after 15 minutes.
  3. Comes with 800 factory presets (demo users can check out the remaining factory presets from the online presets browser though).

Audio demos of SynthMaster's factory presets can be listened at:


KV331 Audio has also been releasing expansions for SynthMaster, in various genres. So far, there are a total of 1900 commercial presets in the 'Everything' Bundle. They can be listened to at KV331 Audio's SoundCloud page:

SynthMaster Player free

KV331 Audio has recently released a free "Player" version of SynthMaster that comes with 500 factory presets. Users of this free "Player" version can purchase and use commercial preset banks released by KV331 Audio. They can also upgrade to the Player version which comes with 1700 factory presets.


On December 5th 2012, KV331 Audio and Computer Music Magazine have released the free (with magazine) SynthMasterCM software synthesizer plug-in. It's available with Computer Music Magazine issue 186 in VST and AU formats on Windows and Mac OS X.

SynthMasterCM is a cut-down version of SynthMaster with the following feature set:

  • 2 wavetable oscillators with up to 8 waves to scan.
  • 2 modulators (sub-oscillators) that can modulate phase/frequency/amplitude of oscillators at audio rate.
  • 1 analog filter with LP/HP/BP/BS modes, before/after filter distortion curve.
  • 1 arpeggiator with up to 8 steps.
  • 4 ADSR envelopes (2 are pre-patched as amplitude and filter envelopes).
  • 1 Step/Glide LFO and 1 Triangle/Square LFO.
  • Polyphony: up to 12 voices.
  • Unison: up to 2 voices.
  • Osc Voice Stacking: up to 4 voices.
  • Modulation Matrix: 10 slots available.Oversampling: 2x (at Good Quality).
  • Delay, Chorus and Reverb effects.
  • 60 Factory presets by Michael Kastrup, Nori Ubukata and Aiyn Zahev.


On January 5th 2013, KV331 Audio and Beat Magazine have released the free (with magazine) SynthMasterBE software synthesizer plug-in. It's available with Beat Magazine issue 86 in VST and AU formats on Windows and Mac OS X.

SynthMasterBE is a cut-down version of SynthMaster with the following feature set:

  • 2 basic oscillators.
  • 2 modulators (sub-oscillators) that can modulate phase/frequency/amplitude of oscillators at audio rate.
  • 1 digital filter with LP/HP/BP/BS modes, before/after filter distortion curve.
  • 1 arpeggiator with up to 8 steps.
  • 4 ADSR envelopes (2 are pre-patched as amplitude and filter envelopes).
  • 1 Step/Glide LFO and 1 Triangle/Square LFO.
  • Polyphony: up to 12 voices.
  • Unison: up to 2 voices.
  • Osc Voice Stacking: up to 4 voices.
  • Modulation Matrix: 10 slots available.Oversampling: 2x (at Good Quality).
  • Delay, Chorus and Reverb effects.
  • 70 Factory presets by Michael Kastrup, Rob Lee and Aiyn Zahev.
User Reviews Average user rating of 4.46 from 5 reviewsAdd A Review

Reviewed By rlared
January 6, 2019

This synth can do pretty much every type of synthesis at this point. You also get tons of presets, which is nice. And there's lots of filter options and they sound good.

The sound quality sounds a little less "high-fi" compared to some of the newer synths like Avenger, Falcon, etc.

The built-in effects don't sound very good in my opinion..

The developer is pretty engaged and active on KVR which is always a bonus.

The main drawback is the interface. For me, it is very clunky to use. There are a ton of tabs and different screens to jump between. Modulation is painful to work with. Also, in general I find the envelopes in Synthmaster (and Synthmaster One) to be difficult to use.

However, for the money, you can't get much more "bang for your buck" than Synthmaster 2... it's a true bargain. Especially if you want to browse through presets. Other newer synths may have better interfaces or features, but there's a big jump in price for the synth and presets usually.

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Reviewed By ubailey
November 26, 2018

This is a very under rated synth. I got it the other day, and I can't stop using it. Already my number 1 synth. I haven't even began to design sounds as the included patches are so good, that I just have fun tweaking those. If you are in to trap or drill music, then this in my opinion is a top of the line synth to have. The only thing that I can think of to ask the developers is to add some visual feedback to better understand what is playing, as this is a monster synth with a lot of parts to it.

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July 31, 2018

One of most advanced VST synths out there.

It's not fun, it's not easy for programming but this beast can do all that many other can't.

Expensive hardware sound from affordable software synth :).

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Reviewed By superfirak
April 9, 2016

Great synth at a great price! Well worth it. Superb sound. It has many presets and many of them sounds good. I really love the cool way of editing and especially love the FM sound.

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Reviewed By Mastrcode
November 6, 2015

SynthMaster is a very versatile Plugin. Ideal for very complex sound designs. I tried a lot of modular VST/standalone software before, but this piece of a diamont tops them all.

You can do so much things with just one instance of this VST to get outstanding results. Synthmaster is suitable for all kind of electronic sound design, electronic music, even for movie scores or game music or sound effects from another universe.

Two layer sections with awesome oscillators. They are so powerful. With a bright palette of waveforms. Analog waves, digital waves, vintage waves, even waveforms of some big synth legends are available. But the most thing i love about the oscillators is the possibillity to load even own created wavefiles for using as waveforms. So there is no limit for a sound design from another world. Together with the modulation sources like the envelopes, very versatile LFO's, filters, arp sequencer, internal FX routing etc. this is a killer synth. If you take the time and go experimental with this VST, you'll get an awesome sound out of this plugin. I'm also experienced in VST programming and coding, but compared to the programmers of this awesomeness i'm just a small shadow behind you and i have to give very big compliments to the programmers of this masterpiece.

Now let's go a bit into detail:

The Layer section:

There're two layers. Each layer has 2 oscillators, 2 filters, a very good arpeggiator, 3 FX sections with different effects like distortion, lo-fi, ensemble fx, a phaser and an EQ. The oscillators can be modulated by 4 additional oscillators, which are routable as modulation sources. Perfect for FM synthesis, amplitude modulation and destruction of the basic soud of the oscillators. Each layer has its own glide pitchbend range and velocity option, a 8 voice unison with unison detune, unison cutoff and unison panning (stereo spread), each layer hast its own volume and panning control and a coarse pitch.

The oscillators:

The oscillators can load a big bunch of different waveforms. Ideal for any kind of sound creating. And the oscillators have a special option for importing own wavefiles for using them as "wavetables" to make your own waveforms. I love this option. The oscillators can work in multimode with up to 8 voices each osc with a voice mix control, detune, stereo spread, adjustable detune curve, phase spread and tone spreat in the voice section of the oscillators. Each osc has it's own volume and panning control, coarse and fine tuning option, a phase control and a high cut filter control. Very awesome, powerful and versatile oscillators. There should be more VST's with such great oscillators.

The filters:

The two filters of each layer can be split, one filter for each of the main oscillators, then the filters can be switchet to parallel routing or switched in series. Also filters have their own distortion unit to overdrive them. Ten they have a switchable 12/24 dB slope, cutoff, resonance and keytracking control. The filters can be modulated by different sound sources over the mod matrix routing. The filter are sounding very good. they can sound clean, but also harsh and very dirty. I like the sound of the filters very much.

The Arpeggiator:

Each layer has a powerul Arpeggiator with the classic arp modes, a arpeggiate mode, a chord mode for arpeggiated cords, and a sequence mode where you can play own programmed tonal squences with just one pressed note. It has an octave range with up to 4 arpeggiated octaves, a arp stage control with up to 32 stages, a sync control for playing the arp in different synced speed (supports 2/1 to 1/32 bars, 2/1 dotted to 1/32 dotted bars and 2/1 triplet to 1/32 triplet bars) and a velocity control with step, note step + note and step x note. This Arpeggiator is very powerful and the right thing for good arpeggios (as an avid trance musician i love powerful apeggiators like this one).

The Voice Modulation section:

Each layer has 4 routable ADSR envelopes with adjustable envelope curves, two very versatile 2-D envelopes, 2 multi stage envelopes with up to 16 stages, 2 LFO's and a key scaling modulator. The LFO's are loaded with sine, triangle, square, saw, step and glide waveforms, speed, volume, phase and noise control, and an attack and release control with adjustable attack and release curves for fade in/fade out modulation of the LFO's and a final volume control. The envelopes are very fast and crisp, what is very important for my needs as a trance producer. I especially love the possibillity for manually adjustments of the envelope curves.

LFO Section:

There're 4 synth LFO's for each layer. They are the same LFO's with the same functions like the LFO's in the voice modulation settings. They ca be routed via the mod matrix, to control/modulate the individual devices.

The Synth FX section:

The FX section contains:

A vocoder with various modulator inputs: Both layers can be set as modulator with the choice of dry or wet layers, this means with or withot the layer's internal effects. Also an external sound source (audio input) can be routed as modulator input.

2 compressor modules with attack, release, threshold, ratio, knee and ain control and also a sidechain input for the layers and external audio sources.

A nice sounding chorus effect with versatile modulation controls (mix, width, pan, feedback, mod rate and depth, and left and right delay offset).

A tremolo effect, with mix, mod rate, sync left/right ratio and phase settings.

Powerful Delay effect with effect mix control, width, pan, feedback and drive controls, pingpong option and left/right delay times which can be switched to free or synced. Then the delay has a low and high shelf EQ and a distortion effect, which makes it easy to create vintage style delay effects like e.g. tape echos or tube delays.

And finally a very good sounding Reverb. It has a mix, size, time and distance control, early and late reflections section with own EQ's and an early/late mix control. A mod amount and a mod speed control, and finally a diffusion, a density and a damping control. But the reverb can be very CPU hungry with long reverb tails.

The FX section has 5 insert slots for each layer where you can rote the several effects to one of the slots. It also contains a global fx routing section with 2 layer send busses with dry/wet controls for each layer and 5 insert slots per bus, where you can rote the several effects to one of the slots.

The Modulation matrix:

The mod matrix has 64 routing slots, each with source and destination routings of most of the modulator devices and a bipolar amount control for each single slot. With this matrix you can create all your modulation routings like volume/filter/pitch/panning modulations and much more.

The output control:

It contains volume and bypass controls for each single layer, a master volume control with an additional +12 dB boost button and a master tune control.

And finally the main settings option:

It cotains the options for changing the GUI skin, the plugin window scale, the global pitchbend range settings (which can also be set individually for each layer and each single preset), the global engine quality and engine buffer size settings (can also be set individually for each single preset). It also contains settings for default loaded standard saw/triangle/square waves for the oscillators while resetting the preset to default. Then there are controls for antialiased drawing, MIDI CC filter lag, mouse filter lag, bipolar easy knob control, and a hide older presets option.

I also like the preset manager. It's very comfortable and makes it easy to browse between the banks and the presets and the Bank/preset categories.

This VST is awesome, it has so much power. If you take the time and learn, how to use this plugin, this VST can be a huge sound monster. And for its complexity and sound quality it is very CPU friendly. At the beginning it needs a bit acclimatization, but when you then broke the ice, it's very user friendly.

Again, big respect to the programmers, big big compliment for creating such a sound weapon.

This is not just a VST, this is great, great art.

My Points: 10/10.

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