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Audio Formatting for UTAU

Before you record your UTAU, it is very important to understand the acceptable audio format that the program will be reading.

So, what kind of format does the program accept? Well let’s talk about UTAU’s origin!

UTAU was originally developed by Ameya for Windows back in 2008, 4 years after Vocaloid was established. So a lot of the formats we will be dealing with are Windows native. Later, in 2011, Ameya would release UTAU-Synth for MacOS 10.5 (Leopard).

What audio format does UTAU prefer?

All your samples should be in WAV format, mixed down to mono, a bit-rate of 16 bits, and a sample rate of 44100kHz.

Why so specific?

This is because UTAU cannot read any other audio format. As for the other criteria, files must be mixed down to mono rather than stereo, or else all of the samples will be reduced to white noise inside the program. Mixing a file down to mono, means you are reducing the sample to a singular channel. Stereo audio has two channels!

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As for the kHz output, it is recommended to stay at 44100kHz.



Onto manual audio formatting…

Q. How do you convert Mp3 to WAV ?

A. Audacity does not accept m4a by default, it can be converted using an online converted such as Cloud Convert or an application such as VLC media player.



Q. How do you mix tracks down into mono ?

A. Before we get started with the track mix down, how do you know a track is Stereo or Mono?

This can easily be identified by locating the sample in the finder application. In this window, Finder will tell you the duration, audio channels, sample rate, and format.

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After identifying your track, in Audacity, you are going to want to import your Stereo track into the program.

  1. In the toolbar, you will want to head over to the, “Tracks,” tab.
  2. To mix the Stereo track down to Mono, Tracks > Mix > “Mix Stereo Down to Mono.”
Success! You have reduced your sample to one singular channel.



Q. How to convert the sample rate of your tracks to 44100kHz ?

A. It is important to maintain the sample rate of 44100kHz for your UTAU’s samples, if your samples are recorded in another sample rate, fret not! This can be fixed very easily.



Multi-track conversion.

  1. Import all of your samples into Audacity.
  2. To check the sample rate, it can be located in a collapsible tab at the bottom of the UI.
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3. Set the sample rate to 44100kHz.

4. To select all files, do Cmnd+A.

5. File > Export > Export Multiple …

6. Select file location, and choose WAV (Microsoft) format.

You set the sample rate for all your samples to 44100kHz.
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