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ZynAddSubFX is a fully featured musical software synthesizer for Linux, MacOS, BSD, and Windows. ZynAddSubFX exposes a wide array of synthesis parameters to make it flexible tool for sound design and a fun experience for playing instruments.

Zyn-Fusion Add Synth Editor


  • Polyphonic with support for legato and mono playing modes.

  • Three synthesizer engines:

    • Additive Synthesis for classic synth sounds composed of a variety of voices with powerful modulation. This exposes modulators ranging from LFOs and envelopes to oscillator modulators for FM, PM, and AM.

    • Subtractive Synthesis for creating variable bandwidth harmonics from filtered white noise.

    • PAD synthesis for creating beautiful pads and other instruments.

  • Powerful waveform generator with up to 128 sine/non-sine harmonics.

  • A variety of filters including analogue modeled filters, formant filters, and state variable filters.

  • Envelopes can have ADSR (or ASR, etc..) modes or can be free modes (with any shape).

  • Effects for Reverb, Echo, Chorus/Flange, Phasing, Wave-shaping, Equalizing, Dynamic Filtering with flexible signal routing.

  • Instruments can be organized in kits, which allows you to make drum kits or layered instruments; this makes possible to use more than one instrument for a single part. It is possible to choose what items from the kit should be processed by the Part’s effects.

  • Randomness settings to create subtle differences in each sound to help create that familiar analogue warmth.

  • Microtonal capabilities with any scale, up to 128 notes per octave, and key mapping.

  • Extensive MIDI/Audio driver support including JACK, ALSA, OSS, and PortAudio. The following MIDI protocol extensions are provided:

    • Floating point notes via MIDI SysEx. Allows the exact pitch of a note on event to be specified as a 28-bit value.

    • Per-note controller events via MIDI SysEx. Allows individual active notes to receive MIDI control events.

    • Per-note pitch bend events via MIDI SysEx. Allows individual active notes to change pitch.

  • Session Management Support via LASH/NSM.

  • Plugin Support via DSSI/LV2/VST.

  • Over 1100 high quality instruments included.

For more information see:


ZynAddSubFX depends on a number of dependencies for building. For more information on building the core along with the FLTK based interface see doc/building.txt and for building the new interface see



  • FLTK (for the oldest user interface)

  • NTK (for the old user interface)

  • JACK

  • OSS

  • ALSA

  • LASH

  • DSSI

Sibling projects


ZynAddSubFX is available under the GPL-2.0-or-later license.

Have fun! :-)

--The ZynAddSubFX team