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Making microtonal music with tracker software

A tracker is a type of music sequencer that was popular back in the day. The tracker scene is still alive, and you can thank it for all the catchy tunes you hear while using keygens. A handful of trackers also support microtonal scales, and I wanted to share some of those today.

OpenMPT (Open ModPluG Tracker)

Open ModPlug Tracker is a completely free music tracker for Windows. It can also be microtuned, so that you can compose music that explores tonal systems made before and after the reign of 12-tone equal temperament (from here on referred to as ‘The Dark Ages’).


OpenMPT can be microtuned by way of Scala files or TUN file import. (Learn how to produce those .tun files, or download some ready made tuning packs). You an also input notes directly, though they must be in the form of decimals. Once a tuning is imported into OpenMPT, you can edit it within the Tuning Properties screen.

OpenMPT microtonal tuning

One awesome feature is that OpenMPT will name the notes of your tuning with letters A-Z from the alphabet. This way, if you have more or less than 12 notes per octave then you can easily recognise your pitches. A5 is one octave above A4, X5 is one octave above X4 etc. It’s as easy as that. (DAW engineers take note, this is essential for microtonalists! We don’t need to see 12-TET note names when we’re using microtonal scales).

If you need even more control over your note pitches, it’s possible to fine-tune the frequency of each individual note.

Note that if you’re using VSTs within OpenMPT, the microtuning feature won’t work for those. Stick to the sampled instruments and your OpenMPT tunings will work just fine.

Little Sound Dj

LSDj (Little Sound Dj) is a music tracker made for the original Game Boy, utilizing the Game Boy’s sound capabilities. It will run on real hardware via a flash cart, or you can run it in an emulator. I run it on an emulator on my smartphone. It’s a great way to kill some time on the bus/train/toilet.


By default, the frequency tables inside the ROM file are tuned to 12-tone equal temperament. But with the aid of a super helpful Perl script by abrasive, the frequency tables in LSDj can be fully microtuned to any tuning system you want. Even non-equal, non-just and non-octave scales are possible – it’s very flexible!

To do this, first of course you’ll need a copy of LSDj, then head to the Microtuning HOWTO page on LSDj’s wiki and download lsdj_tune1.4.

Note, the compiled .exe for lsdj_tune1.4 may give you the following message:

&Config::AUTOLOAD failed on Config::launcher at PERL2EXE_STORAGE/ line 72.

So it’s best to install Perl on your system and run the Perl script itself. For me, this works just fine. But note that you need to use the command line in order to run the script.

With all that set up, your best bet is to move LSDj and the tuning script into the same directory, then make a .bat file to set up your tuning command. I prefer using a .bat instead of writing directly in the command line, because I can save my command, edit it and repeat it later when I want to change the tuning.

When you run the command, you’ll end up with a patched version of the original ROM, so for each tuning you wish to use, you’ll get a new ROM. My Game Boy folder has several of them for various tunings.

Similarly to OpenMPT, with lsdj_tune you can set the note names of your tuning. This way when you make music in LSDj you won’t be encumbered with 12-TET note names from The Dark Ages. Here’s a really simple example using 5-EDO and the note names U V X Y Z:

perl lsdj_tune1.4.perl --cents 0,240,480,720,960,1200 --base A5 440 --names U,V,X,Y,Z --rom --out

Note: the names parameter doesn’t work in ET mode so here I have specified 5-EDO explicitly using cents.

Then load up your new patched LSDj ROM and enjoy! — 2 pulse channels, 1 PCM channel and 1 noise channel is way more exciting with microtones.



Renoise instruments can be retuned by using a neat scl to xrni tool.

First you’ll need to download some Scala files (or make your own). Then install the tool by downloading it and dragging it on to your Renoise window. Within Renoise, make sure that your instrument is selected, and then run the tool. You’ll be able to load up one of your Scala tuning files and it will be applied to the instrument.


MilkyTracker doesn’t have any microtuning function built in, but you can edit the pitch of each individual note. This can be done by using edit mode and assigning the same sample to different notes of the keyboard, each with some detuning.

Obviously this takes a while to set up, so you might find OpenMPT to be more user friendly. Nevertheless this hasn’t held some people back. Here’s the proof, a tasty jam in just intonation using MilkyTracker:

Other trackers

If there are more trackers that support microtonal scales then I would love to hear about them.

Important links

Further reading

Shenmue I Slot House vs Sega Genesis

For this month’s #SaveShenmueHD tweetathon I decided to make a remix of the Shenmue I Slot House music using Mega Drive FM synth sounds. Mega Drive / Genesis geek for sure.

Well, I didn’t use an actual Mega Drive, but I did use FMDrive which sounds as perfect as I can tell. It’s easy to fall in love with that Yamaha YM2616 sound.

A few months back I remixed of the Fields of Time music from Chrono Cross, so if you are a Chrono fan you should check that out too:

Microtonal chiptune music with One-SF2 VST

Sonic the HedgehogI grew up as a gamer. Luckily my aunt was into games too, so I got the chance to play oldschool systems from before my time such as the Atari 2600 and the NES. All of this cemented my interest in electronic music from a young age. (For what it’s worth, my ongoing fascination with drum & bass probably came by playing Rage Racer on the Sony Playstation).

Some years ago, fueled by the nostalgia of umpteen million nerds, the chiptune music genre took off and is still going strong today. For some, the only way to make this music happen is to record from the original hardware itself. For others, it’s good enough to cheat and use VSTs which recreate the sound. Today I want to share one method of writing microtonal chiptune music using a VST called One-SF2.

OneSF2 - SNES Secret of Mana gamelan tuned to slendroOne-SF2 is a free soundfont player VST for Windows, and it has microtuning features baked right into it. Actually, it supports the MIDI tuning standard, so it can load all of the crazy scales I’ve been collecting in my tuning packs.

  1. Download One-SF2 and extract it to your VST folder. It’s about 30MB because it comes with a bank of sounds.
  2. Download the top soundfont “Famicom” from this collection. The Famicom soundfont contains many sounds recorded from the NES. Save it to your One-SF2 folder.
  3. Load up One-SF2 in your DAW!
  4. Let’s get a nice NES synth sound first. Look for a button that says “SF2” and click it. Now you can load the Famicom soundfont downloaded earlier.
  5. This soundfont contains multiple instruments. Find “SF2 Patch Name” and click the left and right arrow icons to scroll through the available sounds. I quite like #2 “Square Wave 25%”
  6. Switch the synth to mono mode. Now when you play a melody, it will sound more like the actual hardware and less like a polysynth. To do this, find the menu labelled “Control Edit”. Select “MIDI” from the list. Now you will be able to find an option called “Mono Mode”, turn this on.
  7. Here’s the key step, let’s make it microtonal! Find the button that says “MTS”. Clicking this will let you load a scale file.
  8. Write some dope xenharmonic chiptunes.

Remember the NES only had 5 sound channels. 2 are pulse/square channels, 1 is triangle, 1 is noise, and the last was used for low-quality digital sampling. You could recreate this capability by using 4 instances of One-SF2 (each using the Famicom soundfont), plus one audio channel with a bitcrusher effect. Read the technical specifications of the Famicom/NES sound chip if you want to strive for the most realistic result.

Here’s some xen chiptune drum & bass I cooked up a few years ago, in a game boy style.

Now, if only someone would make a version of Clotho from Columns tuned to a beautiful meantone, I could die a happy man…


Where to find more video game soundfonts

Here’s a collection of soundfonts from various game systems.
And here’s a mother lode of soundfonts ripped from SNES games.


Alternative pathways to microtonal chiptune music

Plogue Chipsounds supports Scala tuning files, emulates several oldschool chips, and opens the door to microtonal chiptune on Mac OS X and Windows (32/64-bit). Costs about 95 USD (as of early 2017).

Plogue Sforzando is a free and simple soundfont player much like One-SF2, but it works with the SFZ file format instead.

Pick up a second-hand console system and do it the old fashioned way, with tracker software and a soldering iron. Some trackers support microtones natively!

One-SF2 has a big brother, XenFont. This free, 32-bit Win-only VST adds heaps of synthesis functions on top of the basic soundfont player. A plethora of options exist for creating deep sound designs, so my own work always features XenFont instead of One-SF2.