Dec 062011
 Xenharmonic FMTS VSTi
An FM Synthesis VSTi for the Creation of Microtonal and Xenharmonic Music
Has been updated to Version 1.1
Enhancements and bug fixes:
  • Added exponential response to the Filter 1 Cutoff Frequency control slider.
  • Added 60 total automation targets for host DAW automation. Automation targets are included for: ADSR, FM-RM Oscilllator Algorithm, Effects Section, Filter Section, Global and Local Microtuning, Operator Waveforms and Oscillator Section.
  • Added Phase Center slider for the Phase/Pulse Width Oscillator LFO.
  • Added more presets.
  • Added more microtunings.
  • Added more partials files.
  • Update to manual.
  • Improvement to FM-RM oscillator quality, especially in the bass range.
  • Changed name of Detune effect to Ensemble.
  • Enhancement to UI graphics to make visually crisper.
  • New Plugin ID. Due to the number of internal enhancements, patches created with v.1.0 are not compatible with 1.1
  • Fixed Operator Keyboard Tracking Slider bug.
  • Fixed Frequency Limit bug that could cause clipping under certain circumstances.


Please note that Xen-Arts software never has been, and never will be, infected with computer viruses – this we promise. If your virus software ever indicates that our microtonal music software has a virus, this is what is known as a False Positive. Contacting the developer of your virus software to make them aware of the false positive is the best solution.

For visitors who may be new to Xen-FMTS, below are the features of the VSTi that were published back in January 2011.

Xenharmonic FMTS is a 4 Operator FM Synthesis VSTi with a specialized set of features for musicians interested in exploring the expressive possibilities of microtonal and xenharmonic music making.

Microtuning Features

  • Internally loads and externally receives both MTS (MIDI Tuning Standard) Bulk Dump and Single Note Microtuning Files.
  • Operator ratios can easily be set to values that are coincident with the microtuning being used, thereby producing tuning related FM sidebands in the timbre of the instrument.
  • Isoharmonic spacing of the operator ratios.
  • Precise values may be set for microtonal pitch-bends.
  • Arbitrary microtonal period shifting makes it possible to pitch transpose in both octave and non-octave increments.

FM-RM Oscillator

  • 4 Operator FM Synthesis with Ring-Modulation.
  • 57 Operator Algorithms.
  • 11 different Operator Waveforms.

Phase & Pulse-Width Oscillator

  • 22 Waveforms.
  • Phase & Pulse-Width LFO Modulation.
  • Envelope Generators
  • 6 independent Envelope Generators dedicated to modulating Operators A-D, Filters and VCA.
  • Velocity sensitive.
  • Keyboard tracking.


  • 2 State Variable Filters with 12 and 24 dB response.
  • Cutoff frequencies modulated by Velocity, Envelope Generator, LFO and Keyboard Tracking.
  • Low Frequency Oscillators can be set to modulate the cutoff frequencies of the filters at audio rates, thereby producing sidebands in the signal.


  • Saturator for subtle to extreme distortion.
  • 6 dB LPF Warm Filter.
  • 4-Voice Stereo Ensemble Detuner.

This VSTi is a gift to the xenharmonic and microtonal community, as well as to musicians and composers who are interested in exploring the exciting possibilities of microtuning in their music. It is being offered as freeware.


 Posted by at 1:57 am

  15 Responses to “Xenharmonic FMTS VSTi 1.1 | Maintenance Update”

  1. awesome, i can’t wait to try it out, it looks very interesting!

  2. thanks for the DAW targets. Is there a list of specific targets, or just the sections posted above? I just scanned the manual and didn’t find
    anything about the DAW targets.

    thanks again. off to play…

  3. Hi rawore,

    The automation is summarized in short form in the manual without much in depth detail. The labels that appear in the host DAW are pretty self-explanatory. If any of them don’t make sense, let me know and I’ll explain their functions.

    Glad that you’ve got the update. I was hoping that you would see it and thanks kindly for all the positive comments in the past – most appreciated.

    If you make some tunes with it, please make me aware so I can check it out. Would love to hear anything you’ve done with microtones. 🙂


  4. Hi Jacky
    I’d like to try – it look just like what I’ve searching for – but the download link doesn’t seem to work

  5. Hi Nickman,

    Sorry for the dl hassles. Try it again if you like. I’ve just configured it on another service.

  6. Hi Jacky

    Thanks very much – just trying it out now!

  7. Hi Nickman!

    Let me know how you get on with it, and if you make any tunes, please make me aware of them. Would love to check out anything made with Xen-FMTS and microtones.

    In the background I’ve been thinking about the evolution of version 2. There are many things I would like to update, primarily among them are the filter section, which I feel can be both simplified, and enhanced, with a new filter design. Also would like to have pitch envelopes, which in retrospect is a small shortcoming of version 1. Once we have pitch envelopes, the synth will be able to handle a much more broad range of FM possibilities.

    I’m open to hearing what others would like to see in version 2. In fact, this 1.1 iteration addresses all the enhancements that musicians had asked for since the initial release.

  8. Suggestions for v2… My biggest gripe is it’s too big of a gui… try placing some of the functions on other tabs, or something please… other than that, thanks for a wonderfully useful microtonal tool!

  9. Hi,

    Both the beta testers and myself agree with you about the UI size. I use a pretty big monitor with my music and development workstation though, so it’s not as much of an issue personally, but for friends using laptops, it is a common concern. I will certainly take this and anything else users care to offer seriously when the time comes for the redesign. Admittedly, taking into consideration the screen resolutions of a large number of potential users is a learning process.

    A new microtonal synth currently in the works does however take this into consideration from the beginning.

    Thanks for the insightful and positive comments; greatly appreciated.

  10. Hi everyone, I would love to know if there’s a version of this Vst for MAC!! Cuz I can even open DLL files =(

  11. Hi vic,

    Very sorry to report that this 32-bit VSTi is only available for Windows.

    I’ve got many friends and close colleagues that use the Mac platform and it has long been my wish that there were a way to share these tools with them.

    Hopefully someday things will evolve in a direction that is favorable for both 64-bit Windows and Mac, but these are things that are entirely out of Xen-Arts’ control for the time being.

  12. Hey, thanks for the Free Stuff, look´s and sound´s very intressting, i will test it…thx very much, nice work…do you know Atlantis VST by jeremie Evers? This is also a wonderful experimental synth…good luck, dont stop working…

  13. Hi dude,

    I’ve not been aware of Atlantis, but just took a look at their web and it does appear to be an amazing synth design. It was unclear if it featured microtuning though.

    Thanks for dropping by. It’s feedback and music from visitors and users that keeps all of the development work fresh, fun and interesting, because as one may easily infer, it does actually take an enormous amount of time to create these tools that enable musicians to explore alternative intonation systems.

    Xen-FMTS is due a major update sometime in the future and a good plan for the new design is already in place. At the moment though, I’m primarily focused on music projects. It’s my hope to return to development some time at the end of summer or beginning of fall.

  14. Hi there, thanks for the program , im downloading and will check it soon . I have a question and a proposition . Im a musician that studied oriental music temperaments and i was wondering if there is a midi or max/msp , pure data , or something that can be setted to give a predefined scale as “Beyati” wich has some 3/4´s of tone steps in it. In ableton live there is some similar simple effect called “Scale”, im wondering something similar but for each “makam” or “maqam” as well as indian “Raag´s” or “Raaga”. I have the knowledge about exact intervals, books and references for Turkish Ottoman (with 1/9´s of tone) , Iranian (mostly 3/4´s) and Indian (?¿). There are many scales to add to the colors of our contemporary compositions in west , that we are missing storically, since 12 notes temperamented system. I will explore your software and give thanks for realising it free again. If you have some tip or group/forum were i can find max/midi/programming nerds that would be interested in producing such a device , if it doesnt exist yet.

  15. Hi Carlo,

    Welcome to you and thanks for coming here to share your ideas.

    Back in March of last year, I bought Ableton Live Suite, which, as we know, is totally 12-locked, without any apparent recourse for microtuning the Suite instruments, either now or in the future.

    Pretty soon after realizing this, I made a prototype (monophonic only) VST plugin for microtuning the Suite instruments with the pitch-bend method, which can also load MTS files. The downside is that most all of the presets in Suite use different pitch bend ranges, and typically the default range is an equal tempered 4th. It was my final opinion that trying to microtune Ableton Live is totally futile. Only Ableton as a software company will ever be able to make this work as it should, and it’s just too much of a hassle to deal with the pitch-bend method for users in this particular host; and especially this is true where users will want to polyphonically microtune Suite instruments, as Live just doesn’t deal well with multi-timbral configurations. It is tragic somehow that the entire Suite of instruments cannot be microtuned, and it is a state of affairs that is likely to change in the near future, as many musicians have asked Ableton about this to totally (tone)deaf ears.

    Having said that, there may be some experienced Max4Live developers that have the skills to overcome these limitations, but there is, as of yet, no viable solution, otherwise all Live users would be working with it even now. I’m imagining that with the right workarounds, Instrument Racks in Live could be used as a possible solution to polyphonic microtuning.

    All the same, if you can provide me with your microtuning values, in cents, ratios, frequencies, etc., I will happily convert them to MTS for you, and will even show you how to do it too if you like, as I’ve helped many countless individuals learn how to make their own MTS, TUN and SCL files using Scala.

    Please feel free to write using the Contact information on the navigation bar above if you like.

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