☢ UTAU Interface & Settings ☢

☆ Interface Overview ☆

The UTAU interface functions very similarly to other MIDI softwares. Here, I've labeled most of the general functions:

Hovering over most buttons will also tell you what they do.

As mentioned, clicking the voicebank name is a shortcut to the project settings. Clicking the voicebank icon will open the voicebank info.

☆ Project Settings ☆

UTAU project files are called USTs, which stands for UTAU sequence text. To change the settings of the UST, we use the Project Configurations window, which will pop up on the prompt for creating a new file, or can otherwise be opened using the methods discussed previously.

The project name is usually the name of the song. This is not the same as the name of the UST file, which we choose upon saving like in any other software. Therefore, this isn't necessary to set, but it can help you stay organized if you're working with multiple USTs at once. The output file name is the name of the .wav file that will be rendered from the UST; it's not necessary to set this, as we can name it whatever we want when we go to render the file.

☆ Render Settings ☆

Resampler & Wavtool

The resampler is the executatable that actually performs the rendering process; it takes the samples included in a voicebank and, well, re-samples them based on the note settings. UTAU comes with a default resampler, but there are many others that can be downloaded and used. The wavtool handles the way the samples are strung together; most resamplers will work with the default wavtool, but not all of them are compatible with every wavtool and vice versa.

Each resampler functions slightly differently, so the resulting render will be different even for the same voicebank. A lot of voicebanks will list what resamplers they recommend in their readmes, but you may experiment with different ones until you get one you like the sound of. Here is a comprehensive list of resamplers and wavtools, including download links and example renders.

I'm partial to moresampler for clean vocals (note that moresampler also needs to be set as the wavtool to function) and tn_fnds for "pitchless" vocals such as growls and whispers, but again, this is going to vary from voicebank to voicebank, and your preferences may differ from mine. I also periodically use TIPS and bkh01.

You can download your resamplers directly into your UTAU program file, or, as I do, keep them in a subfolder. If they are in a .zip or .rar, be sure to extract them.

To change the resampler, open up the project settings and, next to Tool 2 (resample), either type in the name of the executable, e.g. TIPS.exe, or click on the ... button to locate the .exe yourself. Note that if your resampler is in a subfolder, you'll need to type in the local file path, e.g. resamplers\TIPS.exe. If, for whatever reason, it's not in your UTAU folder at all, you'll need to type in the entire file path, e.g. C:\Users\[user]\Documents\resamplers\TIPS.exe.

To change the wavtool, do the same but with Tool 1 (append).


Flags are specific render settings that are used to alter the sound of the samples, mostly through adjusting the frequencies and formant. To oversimplify a complex topic, frequency is the pitch at which a note is sung as well as all of the overtones that come together shape the sound. Formant referers to what region of frequencies is most intense. Flags are completely optional to use.

Some flags are universal, while others are resampler-specific. Here's a quick reference for the default flags and some for other resamplers, and here's a more comprehensive list that requires downloading a PDF to see the whole resource.

Like resamplers, a lot of voicebanks will list their recommended flags in their readmes.

To apply flags to the entierty of UST, type them into the box next to Rendering Options in your project settings. The syntax should be X#Y#Z#, with the flag's name and value and no spaces between them, like g-5B30H20. The order of the flags doesn't matter, but note that flag names are case sensitive, meaning that an uppercase letter like G is different from a lowercase letter like g.

(I made add a list of flags and resamplers directly to this site at a later date; for now please use those other very good resources that have already been made!)

☆ Plugins ☆

Plugins are optional third-party applications that you can run inside of UTAU; they are typically used to edit the UST in some way that's easier than doing it manually. Since each one has its own settings and functions, I'm not going to go over many of them in this resource, but I will explain how to add them and how to load them inside of UTAU.

Much like a voicebank, you can download the desired plugin and install or extract the contents into its own folder within the UTAU\plugins folder.

Then, to load it into UTAU, you simply navigate to Tools(T) > Plug-Ins(N), and find the one you wish to run on the list. If it's not showing up, try clicking Reload(R). If this doesn't work, either, make sure that the plugin's root folder is directly inside of plugins and not inside of an unnecessary subfolder, and make sure that the root folder has a file called plugin.txt inside of it. plugin.txt, similar to character.txt, is what tells UTAU the name of the plugin and what executable to run when it is called.