This plugin is included in our new MEGA Bundle Subscription and in the new Unfiltered Audio Bundle Subscription at no extra cost!

Welcome the King of the Synthesis Jungle

After developing some of the most innovative and forward thinking audio processing tools in the world of plugins, Unfiltered Audio is reaching for new heights with their groundbreaking first synthesizer. LION is an extraordinarily deep synth that features an easy-to-use interface with everything you need for quick patching, endless experimentation, and intuitive sound design.

Under LION’s hood is a dual-oscillator architecture with each oscillator featuring 26 modes. These modes range from familiar classics to unique oscillators found nowhere else. Pick and choose from FM synthesis, subtractive or additive waveforms, "super" oscillator stacks, microsound, noise, or variations on each!

Each algorithm has been specifically designed for deep modulation. Additionally, each oscillator engine features an optional Stereo mode, creating wide images at the synthesis level. From there, you can take advantage of LION's deep Unison manipulation of every parameter and optional tuning Drift for rich, full, and lush sounds with just the oscillators, all before you start reaching for any external effects.

Furthermore, LION is also rather unique in the way that it turns oscillator mixing into another opportunity for creative synthesis. The mixer offers distinct modes for combining the two oscillators in ways not seen in any other synthesizer. The default algorithm acts as a standard crossfader while more experimental modes such as Bitwise operations, Bidirectional Sample & Hold, Ring Modulation, Min/Max, Wave Terrains, and direct comparison operators create non-standard relationships between the two oscillators, all leading to truly amazing sounds.

Unfiltered's peerless modulation system is here and better than ever. It now includes a massive MIDI In Modulator that translates your playing into numerous opportunities for deep expression. For example, you can control the filter cutoff knob with the last MIDI note value or modulate the oscillators' timbre through Velocity control. With full MPE support, you can use controllers like ROLI Seaboard or Sensel Morph for incredible per-voice articulation.

With all of these features, you have the ability to craft sounds that feel as though they were produced by a large chain of plugins, tabs, and automation.

The Power Lies Within

Many soft synths include a small library of forgettable effects, but with LION, you can ditch the need for external effect plugins. LION features Unfiltered Audio's already legendary BYOME effect row, a flexible library of over 40 modulatable effects. LION's synthesis engines and BYOME row all have access to the same modulation sources, so you can build complete presets with detailed effect chains that react to your playing. The possibilities here are truly endless, and a factory library of nearly 600 presets across many genres and styles will prove it to you.

Finally, LION takes Unfiltered Audio’s concept of “serendipitous sound design” and expands on it with a refined version of the randomization engine that was introduced in BYOME. While browsing through hundreds of presets in search of inspiration, you can take advantage of the new scalable randomization depth. This lets you add anything from tiny amounts of variation each time to completely new presets that bear almost no resemblance to the original source.

All of this power is contained in a single-interface GUI with clear, intuitive controls. Instead of spending time watching tutorials to learn the intricacies and hidden features of a synth, you can now focus on the music.

So, what are you waiting for? Try LION today to get a new perspective on what is possible in the world of modern soft synthesis.


  • Over 20 unique oscillator modes, each with an optional, unique stereo algorithm
  • Per-voice modulation
  • Eight unique mixing algorithms for smashing together two oscillators
  • A complete BYOME row for unlimited, modular effect processing
  • Intuitive UX through carefully crafted single-page design (No Tabs!)
  • Modulatable unison depth for every oscillator control
  • A new tag-based preset browser
  • Full MPE support with modular routing
  • Full microtuning support (via TUN files)

Audio Examples

Industry Reviews

  • Thomas Schumacher

    Thomas Schumacher

    My first impression is excellent. The whole sound is fat and unique, it fills a niche that I have been searching for in software synthesizers. It has quickly become a must have in my studio… Read More

  • Richard Devine

    Richard Devine

    Sound Designer/Artist (Hollywood Edge, Sound Delux, Sony Creative Software)

    It’s very exciting that Unfiltered Audio took their open modular approach to synthesis with their latest creation LION. This synth will be a permanent tool in my audio arsenal.

  • Robert Babicz

    Robert Babicz

    Music Producer, Mastering Engineer, Live Performer

    I really like LION. It makes total sense that Unfiltered Audio made a synth. Very fresh and modern!

  • BT (Brian Wayne Transeau)

    BT (Brian Wayne Transeau)

    Musician, Composer, Singer, DJ and Audio Technician

    Lion is a remarkable achievement in soft synths. A truly new paradigm. There are familiar tools with an exotic and inspiring workflow. Less software and much more like having patch cables around… Read More

  • Sven Wittekind

    Sven Wittekind

    DJ / Music Producer

    LION deserves its name because it's truly the Lion of Synthesizers. When I got the chance to test it, I was instantly impressed by just clicking thru the Presets. Right after that I started making… Read More

Customer Reviews

  • Lion is great!!!

    by Russia
    Lion is damn good synth. It took me about 1 hour to turn up and down it's handels and wires and I decided to grab it! Really cool, fat, enormously inspiring an musical! Now it's one of my favourite… Read More
  • Lion is a beast

    by Krel
    This Plugin is a gamechanger of sound desing!

    by Chromatic Photophore
    This thing is absolutely incredible - a sound designer's dream. I simply cannot fathom all of the sounds I can make with this thing. I'm gonna be playing with this for the next several years and… Read More
  • UA Lion

    by sjcongo
    I love synths... hardware or software but this blows my mind every time i need something totally different and this does the sounds that i dream dark and dirty digital power sounds
  • excellent

    by DJM
    I think it`s underrated. The dimensions for sound-designing are amazing and tremendous in combination with byome and triad. 5 of 5 stars! good work


Supported Plugin Formats
AAX Native, AU, VST2, VST3

Supported Operating Systems
MacOS 10.11+ through 10.15 
Windows 7 through 10
Please note: LION is only available on 64-bit systems

Intel CPU only (minimum 2 GHz recommended)

Intel-compatible CPU with SSE2 instruction set (Pentium 4 compatible or higher; minimum 2 GHz recommended)

System Requirements
Display resolution: 1440 × 900px or 1280 × 960px or higher
Memory: 2 GB RAM


With the Installation Manager you can select, download & install all the Plugin Alliance products. Select any and all formats you need for your system! Mac & PC.



Unfiltered Audio LION - Changelog

Version 1.4.0 (Mar 30, 2022)
- added Apple Silicon support

Version 1.3.3 (Aug 20, 2021)
-Fixed: modulation cables do not attach properly

Version 1.3.0 (Apr 23, 2021)
-Fixed a bug where saved projects in some DAWs would reset both oscillators on load
-Fixed preset name always showing "Default" on project load.
-Added Oddsound MPS-ESP tuning support

Version 1.2.0

Version 1.1.4 (Sep 3, 2020)
-fixed a pop sound when opening the UI

Version 1.1.3 (Apr 7, 2020)
-Fixed crash when temporarily unloading plugin in Logic
-Fixed crash issues with GigPerformer.
-Fixed rare Windows crash when deleting plugin in VCV and REAPER (potentially other DAWs)

Version 1.1 (02/28/2020
- Full Catalina support and notarization
- HiDPI support improvement
- OpenGL Removed
- Fixed quantization not working on main Oscillators bug
- Fixed filter interpolation bugs on first note
- Zipper fix on LP12 filter
- added unison phase randomization option
- added legato modulation reset stop

Version 1.0 (Sep 13, 2019)
- Initial released version