“Simple Microtonal Synth” easiest to use microtonal VST, ever. Plus, it’s free.


Download Simple Microtonal Synth VST v 1.1 HERE. (8.81 megs)

(this is the 32- bit version. For the 64-bit version, go here.)

Song done mostly with this synth

Other VSTs we make, including some microtonal

Video walk-through of sounds

Simple Microtonal Synth

is a free polyphonic VST microtonal Windows synth from Michael W. Dean of BipTunia.
It is robust. It is also the easiest way to get into making microtonal music, period.

Simple Microtonal Synth has 32 pre-sets,
and 5378 microtonal tuning options.
Simple Microtonal Synth is a no-nonsense introduction to microtonal synthesis, and it’s very musical. This synth is great for heavy bass, forceful leads, crystalline chimes, and more

TIP: Don’t be afraid to experiment with microtonal music if you don’t yet understand the math.
While eventually learning the math is good, and we included resources for that. And with this VST, no math is even needed to start making cool microtonal music.
In fact, an ability to create compelling music with a tiny bit of understanding of microtones will go much further than the opposite.

Simple Microtonal Synth is a very musical homage to vintage analog synths.

Simple Microtonal Synth is microtonal and polyphonic, and as simple as can be.

Unzip and put the folder
inside your DAW’s VST folder.

System Requirements:
Simple Microtonal Synth is a 32-bit Windows synth, but it tested fine on 64-bit Reaper, and of course also on 32-bit Reaper. It should work on any 32-bit DAW, and on many 64-bit DAWs.
Though in 64-bit Reaper, the presets will show up in a second window, like this:

(^ If the window on the right isn’t wide enough to see all the preset names, you can grab either side of it with your mouse, hold down the left mouse button, and drag the window wider.)

If you can’t even see the main colorful window with the kitties, click the button on the VST picker that says “Show UI” (user interface):

GETTING TO KNOW Simple Microtonal Synth
SO…This VST has 32 presets, and 5378 tunings (scale files, in MTS format).

Each preset has a different tuning, but you can use the picker to add any of the tunings to any of the presets. You can also make your own synth patches. And, if 5376 tunings isn’t enough, you can add your own tunings. They should be in MTS file format, put into the


folder inside your VST folder.

The controls are standard, ADSR, Filters, Delay time plus delay feedback. The one unusual thing is the slider marked Drive controls the volume, but in some cases, also changes the personality and the tone and action of other sliders…Especially the S (sustain) and the Filters.

You can make your own scales using Scala, which is free.

The order of MTS files in our presets are set up somewhat randomly, to encourage experimentation. But you can stop using the set tunings in a given preset at any time, and pick your own. You do this by clicking on the file picker near the bottom right, on the “CHOOSE TUNING” section at the bottom, and picking any of the 5376 scales.
The archive also includes Sevish’s PDFs about many of the tunings, included at his suggestion. They are a great read. Very educational, but not at all dry.

If you read about a tuning you like and want to try it, you can click the file picker icon in the bottom right of the User Interface, circled here:

This will open up the list of tuning MTS files. From there you can just go down the list and try different scales, or you can find specific ones; there is a search function where you can type the scale name. It will bring up your result or results:

From there, click on the file icon to use the scale. (Where it says hulen_33” in the above image. But it will be replaced by the name you searched.)

Tip: If you want to play in typical western 12-tone equal temperament, pick the tuning
12 TET

The mod wheel on Simple Microtonal Synth isn’t set to do anything. But the pitch wheel works.
For more on making microtonal music, read this article I wrote.

Check out our other free VSTs here.
Check out my microtonal music here.

VST ID of Simple Microtonal Synth: sMts


Enjoy, and please tell two friends.

If you want to donate, there are links on the left sidebar for patreon, Bitcoin, and PayPal. Or you can buy one of my albums for you or a friend, on BandCamp, or any of these services:

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BipTunia Synths has been licensed for VST SDK use by Steinberg. Agreement countersigned by Steinberg on August 23, 2018.

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2 thoughts on ““Simple Microtonal Synth” easiest to use microtonal VST, ever. Plus, it’s free.

  1. Dear Michael,
    As a university teacher in acoustics, I write to say that Simple Microtonal Synth is an outstanding new development. Thank you for releasing it.
    I have only one question. Is it possible to play the 5378 microtonal tunings individually, distinct from your musical creations.
    You describe them as scale files in MTS format,but despite extensive searching I have not found any device that will open them .Could you PLEASE help me.
    I did write to you previously, but I do realise that you are very busy.
    Thanking you in advance, Clive Wood, M.Sc;D.Phil. Cardiff University

    1. Hi Dr. Clive,

      Thank you for the kudos.

      I don’t recall seeing a question from you before.

      In my VST synths: https://biptunia.com/?page_id=2070

      I may have used “Scala files” meaning “made with the program called Scala.”

      I understand the confusion. Scala the program also has a format for storing microtonal tunings called .scl, which some call a Scala file.

      I think I can answer your question about using the tunings in other things, but I think I need you to define the question more.

      Are you looking to use a different VST synth with tuning files? There are other synths, most of them use .scl files or .mts files or some other formats. But none of them have this many files included and none are this easy to use.

      Here is a list of most of them:

      I also have an article that might answer some of your questions.

      Someone did make a sort of holy grail of xen software, a VST that can re-tune other VST synths, but it can’t import files, and can only do EDOs up to, I think 20.

      But the guy never released it in public. He seems to want to spend 10 years improving it. I explained fast beta release philosophy, but he wasn’t into it.
      I have a copy of it though if you want it.

      I also make a free microtonal sampler VST, it can import any audio file and play it in microtonal tunings:


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