Zebralette free software-synthesizer by u-he

Zebralette is a free software synthesizer developed by u-he and used by many famous music producers. Available format(s): VST, VST3, Audio Unit, RTAS for Windows 64b, macOS.

Zebralette is just one of Zebra2’s oscillators packed into a simple, easy-to-learn framework – but you have everything you need to make some pretty amazing sounds. Sound that can be directly loaded into Zebra2 later. And should you eventually decide to upgrade to Zebra2, you will already know everything there is to know about the oscillators – which is quite an advantage.

Zebralette has two LFOs (one per voice, one global), a multi-stage envelope and three on-board effects (chorus, EQ, delay). Not forgetting Zebra2’s famous dual spectral effects, which include several squelchy filter algorithms.



Syntopia free software-synthesizer by Syntopia

Syntopia is a free software synthesizer developed by Syntopia. Available format(s): VST for Windows.

Syntopia is a modular software synthesizer for use with a VST host. DX instrument and stand-alone editions are planned. Emphasis will be put on a functional graphical user interface, and a lot of freedom in the choice of synthesis algorithms/structure.

Syntopia is a C++ project for the Windows platform. Macintosh and Linux versions are a possibility but will require the participation of other programmers.


SynC Modular

SynC Modular free software-synthesizer by Dr SynC

SynC Modular is a free software synthesizer developed by Dr SynC. Available format(s): VST for Windows.

SynC Modular is a modular software synthesizer.


  • High Performance: The performance of SynC Modular compares to the performance of non-modular software synths. This means higher polyphony and/or patch complexity.
  • Flexibility: SynC Modular allows you to create your own oscillators and filters (using Z-1 modules of course).
  • Multi-timbrality: SynC Modular allows you to have as many as 16 parts playing together. Each part can select a different instrument in realtime by receiving a MIDI program change.


Sonigen Modular

Sonigen Modular free software-synthesizer by Sonigen

Sonigen Modular is a free software synthesizer developed by Sonigen. Available format(s): Stand Alone, VST for Windows.

Sonigen Modular is a modular software synthesizer which combines the freedom and flexibility of classic modular synthesis with the benefits of a modern software implementation. The user interface is quick and intuitive to use while still affording the sound designer great freedom. The audio processing algorithms are of high quality while still being CPU efficient.


  • Sonigen Modular is fully modular, with as many modules and patch cables as you want.
  • It combines polyphonic voice and static effect processing in one window. That means you can have multiple MIDI notes playing multiple voices, mix them all down to a single stereo stream and route that through a modular effect chain.
  • It is fast and intuitive to use, almost everything is done in the main module window. There’s no separate schematic / GUI views, no macro modules, no separate FX window. You can see what is going on just by looking at the main window.
  • Great sound quality. A huge amount of time has been put into developing high quality algorithms. It has very good aliasing rejection in most cases.
  • It is CPU efficient. This doesn’t mean corners have been cut. It means hand tuned assembly and run time optimization. The audio processing code is dynamically assembled and optimised in real time as you edit and play.



PIO free software-synthesizer by Tyapu

PIO is a free software synthesizer developed by Tyapu. Available format(s): VST for Windows.

PIO is a synthesizer features an ADSR, filter MOOG, pitcher, also has a Arpeggiator that is the heart of the synth.

PIO is class exclusive electronic sounds as were the sounds of your games to prinsipio births sounds as computers clasicos.

Pio has 50 song so you can start experimenting.


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ModulAir free software-synthesizer by Full Bucket Music

ModulAir is a free software synthesizer developed by Full Bucket Music. Available format(s): VST, Audio Unit for Windows 64b, macOS.

ModulAir is a modular polyphonic software synthesizer for Microsoft Windows (VST) and Apple macOS (VST/AU) written in native C++ code for high performance and low CPU consumption.

ModulAir is a work in progress, currently in Beta, unfinished, as of now with only a bunch of quirky presets and a lousy documentation. I am not sure if it ever reaches the General Availability stage since I am constantly adding modules and stuff to it:-).

The main features of ModulAir are:

  • Fully modular architecture.
  • Up to 18 modules per patch.
  • 51 module types available.
  • Polyphonic Voice and monophonic Master modules.
  • TUN/SCL micro-tuning file import.
  • Up to 64 voices polyphony.
  • MIDI Learn – all parameters can be controlled by MIDI CC.
  • Double precision audio processing.
  • Plug-in supports Windows and macOS (32-bit and 64-bit).

{See video at top of page}







Matrix free software-synthesizer by Mainstream Audio

Matrix is a free software synthesizer developed by Mainstream Audio. Available format(s): VST for Windows.

In Matrix, every “OSC”, “ADSR”, or “LFO” creates its own matrix. In the Routing-section you are able to link these matrixes together to create a sound. You are allowed to modulate the Frequency of the OSCs, the audio stream of your OCSs or just the “ADSR” output value.

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Kx-Synth-X16 free software-synthesizer by KX77FREE

Kx-Synth-X16 is a free software synthesizer developed by KX77FREE. Available format(s): VST, VST3, VST for Windows.

KX-Synth-X16 is a virtual analog modular synth plug-in based on the EMS VCS3 structure, but with some additional features.

Common features with the VCS3:

  • Three variable shape oscillators, tweaked to simulate the color and bandwidth of VCS3’s oscillators.
  • 16*16 pin matrix with feedback connections.
  • LP filter, 18 db per octave with self oscillation.
  • Noise generator with EQ.
  • Ring modulation.
  • Two external inputs.
  • XY joystick.

Added features:

  • Polyphony up to 6 voices. Total control of the polyphony features with the extended KXMOD system.
  • Each voice can be controlled with relative parameters (KXMOD).
  • Analog sequencer (CV & gate) with a memory of 256 CV and 256 gates, files saved on disk, 2 accent lines, random clock, keyboard input to transpose or to record the CV.
  • Mini knobs to adjust each matrix modulation, 0 to 1.
  • Modern skin with notepad and variable color background.
  • Html help file.
  • You can adjust the response curve of the oscillators.
  • The original ASR (trapezoid) is extended to 2 ADSR with Attack Reset mode, Host and internal sequencer synchronization.
  • Delay fx with host synchronization and LFO modulation. It replaces the original spring reverb.
  • LFO, Sample & Hold and third ADSR envelope added, monophonic modulations, they can replace the external inputs (In1, In2).
  • Keyboard scalers.
  • X Y matrix MIDI controllers.
  • All main parameters have a MIDI CC controller.
  • Velocity to envelope segments, cut off and volume.
  • MIDI in splitter.
  • Omni MIDI output to control external monophonic instruments and build polyphonic ensemble, each instrument is one voice.
  • Sequencer MIDI output.
  • KX presets:
    • 27 polyphonic instruments.
    • 12 unison presets.
    • 36 monophonic presets (v1.04).
    • 17 sequencer demos.
    • 14 tutorial and initialization presets.
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Kx-Modulad free software-synthesizer by KX77FREE

Kx-Modulad is a free software synthesizer developed by KX77FREE. Available format(s): VST, VST3 for Windows 64b.

Kx-Modulad is a virtual analog modular synthesizer with a stereo SF2 player and an additive synthesis WaveTracer to build high quality waveforms.

WaveTracer features:

  • Full parameters controls to make Additive Waveforms with no aliasing.
  • Full 32-bit High Quality Waveforms.
  • Easy to use and to create analogue waveforms.
  • Same quality for all clock frequencies: 44.1 kHz to 192 kHz.
  • Independent WaveTracer engine: KxWaveTracer.exe.

Modular Synthesizer:

  • Stereo routing.
  • All modulations are pre-connected, no cables on the GUI.
  • Skin with variable background color.
  • 3 Polyphonic EGs with for each segment: curves, velocity and Kbd controls.
  • 1 Monophonic EG with for each segment: curves, velocity and Kbd controls.
  • Multiple trigger sources and sync for the EGs and the LFOs.
  • 2 Oscillators with 2 waveforms and 2 outputs with Phase modulation and Sync.
  • 2 independent Sub Oscillators.
  • 1 Stereo SF2 player.
  • 2 Monophonic LFOs with 2 Rates and ASR EG.
  • 2 Multimode VCFs.
  • Mixer with 6 sources: Noise, VCO1 1-2, VCO 2 1-2, Ring, VCO1 Width, VCO2 Width and 3 outputs: VCF1, VCF2, VCA.
  • Each mixer voice can be modulated by different sources.
  • Noise Generator with an EQ.
  • Sample&Hold.
  • Ring Modulator.
  • 6 host sync clocks.
  • 2 MIDI inputs.
  • 1 Distortion.
  • 2 Delays with sync, multimode filter and modulation oscillator with sync.
  • 1 Scope with 100 ms of buffer size.
  • Full MIDI learn.
  • Full NRPN implementation.
  • 128 nice KX presets.


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Kamioooka free software-synthesizer by g200kg

Kamioooka is a free software synthesizer developed by g200kg. Available format(s): VST for Windows.

Kamioooka is a polyphonic Full-Modular synthesizer with patch cable system. You can freely combine modules and make patches. 10 module slots and 7 types of modules (VCO/VCF/VCA/ADSR/LFO/MISC/SEQ) are available.

Available modules:

  • VCO : Oscillator, with PWM/FM/Sync functions.
  • VCF : HPF/BPF/LPF filter.
  • VCA : Amplifier with modulation input.
  • ADSR : Two ADSR Envelope Generator.
  • LFO : Two LFO with tempo sync mode.
  • MISC : Ring modulator/Noise Generator/Sample&Hold/Inverter.
  • SEQ : 8 Step Mini sequencer.

In v1.0.2, the Unique-ID of the 64-bit version is changed for 32/64 patch compatibility. Old patch (.fxp/.fxb) made with 1.0.0/1.0.1(64-bit) may not be loadable (If you want to use anyway, VSTHost/SAVIHost can load forcibly and can be convert to new ID by exporting).

{See video at top of page}

Kamioooka Demo 2 (multi instance)