X-Jupitae Wide-Boy

X-Jupitae Wide-Boy free software-synthesizer by CK_Modules

X-Jupitae Wide-Boy is a free software synthesizer developed by CK_Modules. Available format(s): VST for Windows.

X-Jupitae Wide-Boy synthesiser features:

  • 3x Enhanced Dual voice Multi-Mode ‘Flexi’ oscillators with extended harmonics (512).
  • Dual multi-mode filters – Serial or Parallel.
  • 4x Graphic 32 stage envelopes.
  • Ribbon and XY Pad controllers.
  • Very flexible modulation options.
  • 28 note polyphony, Mono mode.
  • Interactive pattern arpeggiator.
  • Full Multi-FX section: Gate, Compressor, 5 Band Eq, Degrader, Distortion, Ensemble, Auto Panner, Stereo Image, 4v Chorus, 5 Tap Delay/Echo, True Stereo Reverb.
  • Large GUI providing quick and easy access to all Synth functions.
  • Activation Keycode can be found on the CK_Modules&VST Forum page.
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Wollo FMERA free software-synthesizer by Erik Wollo

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

Wollo FMERA combines FM style sounds with a Wave player. It includes one dedicated single stereo female voice sample, which is triggered together with the FM sound.


  • 32 voice polyphony.
  • 2 oscillators (carrier and modulator) in each voice.
  • Wave player with dedicated stereo voice wave sample.
  • Modulation filter, depth and keyboard.
  • Separate envelopes for Osc1, Osc2 and wave sample.
  • 2 mono flangers.
  • 2 mono delays.
  • Animated keyboard for easy playing the synth with the mouse.
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Vivaldi MX

Vivaldi MX free software-synthesizer by SK

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

  • 4 times 2 operator FM synthesis, up to 8 oscillators per note.
  • 6 output busses, 2 stereo and 4 mono (if your VST Host supports multiple outputs).
  • Up to 16 channel multi-mode, play 16 different vivaldi sounds independently with one instrument.
  • Up to 64 voices polyphony.
  • Up to 4 parts per note for voice layering, including support for velocity and key window.
  • Sample precise support for the MIDI controllers: volume, expression, panpot, pitch bend, sustain pedal, cc #16 (Mod Level), cc #17 (Feedback Level).
  • Choose different output busses for each channel of the instrument, or for each part of a sound.
  • Polyphony can be limited independently for every channel.
  • Significant performance improvement compared to Vivaldi ‘classic’.
  • Turn unused midi channels off to save CPU time.
  • Turn receive of Program Change/Pitch Bend/Controller off for individual channels to save even more CPU time.
  • Support for all sample rates.
  • Can load all Vivaldi ‘classic’ presets and banks.
  • True 32bit floating point signal processing on per-sample-basis, no down scaling.


Uno FM

ZynAddSubFX free software-synthesizer by paulnasca 2

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


  • 8 Note Polyphonic.
  • 128 Presets.
  • 5 Oscillators:
    • 1 Sine (Carrier).
    • 3 Sine (FM Modulation).
    • 1 Ring Modulation (Various waveforms).
    • OSC Modulation Amount.
    • OSC Tuning, Fine & Vol with readouts.
    • Ring Modulation Amount.
    • OSC MIX (Normal-Ring).
    • Sync On/Off.
  • 1 LFO:
    • Speed.
    • Aftertouch.
    • Wheel.
    • VCO.
  • 2 ADSR:
    • FM Modulation.
    • VCA.
  • Level out with VU Meter Key Tracking (Fixed).
  • High Pass Filter.
  • Effect:
    • Stereo Chorus engine with small delay (0-200 ms).
    • Modulation Depth.
    • Modulation Speed.
  • Arpeggio: (lots of features).
  • Velocity: (Variable).
  • Bend Range 1-12.
  • Portamento (Variable).
  • Mono (On/Off).
  • Retrigger (On/Off).
  • Transpose +/- 5 Octaves.
  • MIDI Receive Channel.
  • 128 Patches.
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Tramp 4

Tramp 4 free software-synthesizer by Deztex Limited Productions

Tramp 4 is a free software synthesizer developed by Deztex Limited Productions. Available format(s): VST for Windows.

Tramp4 is a 4 Operator FM synth with functionality somewhere between a Yamaha DX7 and a Yamaha TX81z.


  • 4 Operators with settings similar to the DX7.
  • Each Operator has:
    • Ratio / Fixed OSC Frequency settings.
    • A 4 level envelope generator and keyboard scaler.
    • AM and PM.
    • Velocity Sensitivity.
    • Operators may be disabled with an on/off switch.
    • An output level.
  • The oscillators may be arranged in 8 different algorithms similar to the ones found on the Yamaha TX81z.
  • A 4 stage pitch EG is useful for messing up the pitch signal before it enters the operators.
  • A delayed LFO.
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Tramp Model A

Tramp Model A free software-synthesizer by Deztex Limited Productions

Tramp Model A is a free software synthesizer developed by Deztex Limited Productions. Available format(s): VST for Windows.

Tramp Model A is an FM Synth with 3 Operators that can be configured into 4 different algorithms.


  • Each Oscillator has Sine, Ramp, Saw, Triangle & Square Wave. Frequency is set by keyboard pitch with ratio adjustments up to +- 5 octaves. A control also can be used to tune up or down 1 octave in semi-tones (notes).
  • Each Operator has a separate 4 stage envelope generator; the rate settings can be multiplied for attack and decay rates that can run into minutes.
  • Each Operator has a separate control for setting the sensitivity for Velocity, Amplitude Modulation or Pitch Modulation.
  • An output level controls the output level for each OSC; each OSC can also be switched off.
  • Two LFOs: each is gated and has an Attack and Release Envelope; each produces Sine, Ramp, Saw, Triangle and Square Waves.
  • A 4-stage pitch envelope generator.
  • Operator 3 includes an adjustable feedback path.
  • A Biquad sweepable filter: Low Pass, Hi Pass, Band Pass or Notch; the Fc (critical / center frequency) and Q (bandwidth) is adjustable. The filter includes a built in gated LFO with Sine, Saw, Ramp, Triangle and Square Waves; the LFO is gated and can be delayed; LFO Speed and Depth controls are also included; the LFO modulates the FC of the filter.
  • Portamento and a Master Volume.
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Tiny Femme

Tiny Femme free software-synthesizer by Tiny God

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


  • FM oscillator.
  • Carrier tone controlled directly or via MIDI in.
  • Input signal modulates the frequency of the oscillator.
  • The squelch knob controls the release time of an envelope follower on the input, which envelopes the carrier tone as well, so it isn’t an irritating constant tone while the input is silent.

NOTE: Tiny Femme is constructed as a synth with input channels, so some hosts may not know what to do with it.


The Lizard

The Lizard free software-synthesizer by Krakli

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

The Lizard is a Wild and Abrasive FM synth with full Envelope and LFO control of all Modulators.

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Syncla-X [Large Version]

Syncla-X [Large Version] free software-synthesizer by Digital Systemic Emulations

Syncla-X [Large Version] is a free software synthesizer developed by Digital Systemic Emulations. Available format(s): VST, VST3, Audio Unit for Windows 64b, macOS.

The first free emulation of the Synclavier II FM Unit… Extended.

“That’s pretty awesome sounding. I love it when I run the bit-depth it has real character. […] It’s very impressive!”

-100 Things I Do, original owner of a Synclavier II.


  • 4 Carriers, 4 Modulators.
  • 8 Harmonics generator.
  • 8 ADSR + 2 ADSR.
  • Individual Pans.
  • Velocity.
  • Filter.
  • Mono/Poly modes.
  • 2 LFOs.
  • 2 Effects: Flanger and Bit Depth.

NOTE: You have to install VC runtimes c++ 2015 to make the software works.

(Only windows, Macs don’t need this obviously).


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Six free software-synthesizer by Odo Synths

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

Six is a simple but powerful 6-operator FM synth with 32 DX7 algorithms and 16 4-operator algorithms.


  • 6-operator FM synth with 32 DX7 algorithms and 16 4-operator algorithms.
  • Every Operator has a fine tune and octave from -6 to 3. Also pulse width.
  • The fine tune can be reset on every operator or for all the operators.
  • 5 different waveforms saw / triangle / pulse / sine / ramp.
  • 8 stage envelope with 4 different curves with an extra time and level.
  • The filter has the same envelope as the operators with 7 different filter types: db12 lowpass / db24 lowpass / 36db lowpass / hipass / bandpass / 4 pole moog filter and a 8 pole moog filter.
  • 3 effects on board: chorus / phaser and a stereo delay with a crosser.
  • Powerful random option to create your own presets very fast.
  • Extra phase modulation and feedback controls.
  • 128 presets.
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