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Synth Plugin by Tone2 Audiosoftware
FireBird by Tone2 Audiosoftware is a Virtual Instrument Audio Plugin for Windows. It functions as a VST Plugin.
System Requirements
Windows XP / 7 / 8 / 8.1 / 10 / Vista (32-bit or 64-bit)

PC formats: 32-bit VST
Copy Protection
My KVR - Groups, Versions, & More
307 KVR members have added FireBird to 29 My KVR groups 379 times.
Not In Your MY KVR Groups
(or group limitation prevents versioning)
+24 in private groups

KVR Rank

Overall: 110   109

30-Day: 137; 7-Day: 136; Yesterday: 212

FireBird features what Tone2 claims is a "new, unique sounding synthesis" - Harmonic Content Morphing (HCM) - see below.


  • A new, unique sounding synthesis: Harmonic content morphing (HCM).
  • 84 oscillator types containing 18,000 morphable waveforms.
  • 38 different analogue modeled filter types.
  • True stereo mode, 4x unison mode, and up to 8 oscillators per voice.
  • Can sound like other synthesis methods - additive, subtractive, AM, FM, phase distortion, supersaw, vocoder, sync.
  • Can sound like natural instruments like piano, brass, organs...
  • 23 spectral manipulations or "modifiers" can be applied to the oscillators.
  • IQM - intelligent micro tuning for cleaner chords.
  • Alias free oscillators, alias free FM, anti-aliased distortion, oversampling.
  • Sample accurate timing.
  • Digital precision as well as analogue warmth.
  • Easy to program and easy to use.
  • 21 arpeggiator types.
  • 13 effect types.
  • 300 hand picked presets included.
  • 11 skinable user interface.
  • Extensive MIDI support.

Harmonic Content Morphing (HCM) Synthesis is based on a large and expandable repertoire of standard waves like saw or pulse as well as complex waves like multi waves, trumpets, organs, pads, pianos, and voice samples. These waves can be modified in real-time by, for example, transposing the wave by one or two octaves and adding it to the original wave, altering its harmonic structure, syncing, compressing or expanding the frequency domain of the spectrum, making the wave fat using only one oscillator by transforming each wave into a hyper-wave, selecting some cycles of a sample and moving through them over time (comparable to wave-table synthesis). Any modification of a wave can be modulated producing lively shimmery sounds. In total there are more than 14,000 different spectra available for combination and modulation.

Latest User Reviews

Average user rating of 4.42 from 12 reviews

Reviewed By MKUltra2021
March 1st, 2021

This plugin is phenomenal! The sounds are clear, and I recommend using it for arpeggios. There are also some really good retro presets to get your songs moving.

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Reviewed By marrbren
March 31st, 2020


Put aside omnisphere and all those over priced programs because this is the all in one for free synths. I don't really ever write reviews for VST plugins but this is absolutely nuts. The sound manipulation is super crazy if you know what you're doing and all the presets are top notch. From trance to trap styles to 80's synthwave you name it, If only I could give this 6 stars.

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July 31st, 2018

Firebird is my biggest love among free synths - multi usable, it's unbelievable even to me that i made over 4000 presets for it with no intention of chasing numbers.That's how love works :).

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Reviewed By
October 14th, 2008

If you are looking for a synth with an excellent sound which is cheap and easy to program you are right here.

This test relates to FireBird+ v1.9

I am FireBird user since 2 years now. I have use it in several professional tracks and also did sounddesign. I really know this machine ;-)

User Interface:
The best user interface of *ALL* vst plugins. At the first view it looks like a one trick one-trick-pony. But it's extremely effective and very easy to use.

FireBird+ has the best usability of *ALL* vst plugins. It's simply genious. Playing with this synth is pure fun. If you press the random button you get a new sound - but a usefull one.

FAT. From science fiction to analogue. The demo mp3s don't really show it's real power. It's not only a trance machine. Be sure that you download the demo of v1.9.
A weak point of FireBird v1.2.1 was the reverb. Tone2 has improved this and a lot of other things with FireBird+.

At the first view it looks like a one trick pony. But it's definitely not. Fetures which are not often needed are hidden in the setup screen. The synth is smart and does a lot of things 'audtomatically'. That's why there is no knob necessary.

Avaliable in a lot of translations.

The synth ships with more than 300 presets. Additional 700 are available in soundbanks. All presets are usefull.

Customer support:
Unlike big companies like NI or Steinberg you get personal support from pros. You're a person, not only a number.

Value for money:
It's a steal and an absolute must-have. It costs only €59. It's worth €119.

Tone2 has provided several free updates. FireBird+ v1.9 is rock solid.

One of the best syths out there. Great sound, excellent usability and cheap. A MUST HAVE!
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Reviewed By grymmjack
November 15th, 2007

the interface for firebird is awesome. there are several skins to choose from and they are all very well done. a LOT of attention to detail and TLC went into the UI. the simplicity of layout and the beautiful tactile feel of the controls is really great. the setup screen is dead simple and it's very easy to use this synth to achieve great sounds quickly. everything important is on one screen and all of the complexity is hidden away from you leaving you only to worry about your sound (the way it should be IMO). the only slightly confusing thing is how the modulation wheel mapping is in the setup screen. it's odd only because setup is usually a global thing, but in firebird there are patch based settings in the setup screen. not a deal breaker for me though at all :)

firebird sounds incredible. it's got some huge sounding filters and the distortion / drive is particularly awesome. the sheer number of filter types on offer is quite insane - but coming from tone2 we expect nothing less than greatness. the various waveforms available are versatile and cover a very wide variety of sound creation possibility and it's simple to quickly change and sculpt the sound by combining them in different ways. my *favorite* part of this synth is the FAT and ANALOG knobs in the sound source section, simply twisting these two at various degrees (which are obviously tuned with TLC to really be useful) is so much fun. you can alter the brightness, tone, and thickness of the sounds to be much more intense as needed, or back it off (which i find myself doing more of because firebird has so much balls) to make things fit more into a given mix.

the features available are very good and easy to use. there are all the staple features you'd expect from a great synth and a few you wouldn't like an advanced IQ micro-tuning system that actually makes a significant difference to the sound output. it's this kind of attention to detail that firebird has all over. there are governors for polyphony and quality for machines that are older or slower as well. i have 0 complaints about the features. Markus (the developer) even added a feature that I requested to allow for my inacurate pitchbend to work better.

the documentation is adequate. i didn't really need it though. it's available in 3 different languages, which is nice.

the factory banks (3 of 128 each) are awesome. the 3rd bank is a nice touch as it is the "init" bank so you can roll your own sound bank with ease. bank A and B have some excellent sounds for electronic music. really good ones that illustrate what this synth can do. the sounds range in category from bass to lead to pad to others and are useful and organized by prefix so it's a snap to dial in a sound you are looking for without hunting around too much. i've already mentioned the fat and analog knobs but i need to mention them again because with those 2 knobs every preset gets a new life. the randomizer is quite a cool feature too that is built into firebird and 90% of the time provides something new and interesting and somewhat useful.

customer support from tone2 in my experience has been great. i've not had any issues with the synth besides the one i mentioned with my pitchbender and that was addressed in v1.9 after almost 3 months of no word from the developer it was quite cool to get a personal email announcing the availability of the new version with that support added in. it was an excellent gift and will keep me a customer of tone2 for a long time to come.

the cost for this synth is €59, $79 which is a total value in my opinion for what you get. after spending quality time with this synth you can tell that a huge amount of effort and insight went into it's plans. the price is fully justified and then some. well worth the outlay.

i've had no issue with firebird in the following hosts: cantabile 1.2, orion platinum 7, tracktion3, energyxt 1.x, ableton live6, flstudio 7, and renoise. i have not used firebird in an extreme scenario yet though, mainly i use it for bass and lead sounds to compliment other synths when doing electronic music.

if you need a good synth with very high quality sounds for a modest price you can do a hell of a lot worse than firebird. if you are new and want to learn about synths and how to program sounds firebird is an excellent choice as it's so damned easy to use and easy to get a good sound out of. it is very encouraging to design sounds when the sound coming out is beautiful to your ears.

this is quite a great synth!
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