Joule (ジュール) is a voicebank for the UTAU software.


Joule's first voice bank, Joule CV, was recorded in 2017, but was only released in April, 2019.

His second voicebank, Joule CVVC, was released a little over a year later in late April, 2020.


Joule is a generally naive, reserved, and absent-minded person. He's rather emotional and impulsive, despite how shy he might come off upon first meeting him. However, he loves making new friends.

Joule is often in his own little world, usually caught either daydreaming or sleeping. Especially when he's not supposed to be. He's the type to stay up all night, typically making music and singing until morning comes. Which could explain his absent-mindedness from lack of sleep

Joule has a younger sister named Octavia

(NOTE: this is just CJ's portrayal of Joule as a character. Headcanon's are welcome!)

  • Likes - maple taffy, corny jokes, daydreaming, all-nighters
  • Dislikes - math (gives him the sniffles), being tickled


  • Joule - Unit of energy; something Joule is full of!
  • ARPAbet pronounciation - {JH UW1 L}


  • Hair color - peanut brown
  • Headgear - headphones
  • Eye color - bright blue
  • Outfit - A blue hoodie over a navy sweater vest and a white button up beneath. A red bow tie nicely tied at his collar, sneakers of the same color with a white lightning bolt and black accents, and black slacks.

Voicebank distribution

Voicebank Reclist Range Description DL
Joule CV CV F#2~A3 "clear, youthful male vocals" [1]

Voice details

  • Input - kana encoded and romaji aliased
  • System - Microsoft Windows
  • Details - mono-pitch CV, recorded at C3. Provides good quality vocals and is great for beginners.
  • Features - vowel transitions [* x], note endings [x R], and 3 breaths
  • Recommended resampler - Moresampler

Voice samples

Voicebank Reclist Range Description DL
Joule CVVC CVVC F#2~F#4 "bright, youthful male vocals" [2]

Voice details

  • Input - romaji encoded and kana aliased
  • System - Microsoft Windows
  • Details - bi-pitch CVVC, recorded at C3 and G3. Provides good quality vocals. Great for beginners who use the CV portion of the voicebank.
  • Features - full VV support, CV style vowel transitions [* x], note endings [x -] or [x R], end breaths [x br] and [x br2], 3 breaths, and extra ん sounds
  • Recommended resampler - Moresampler

Voice samples

Additional information

Terms of Use

All the provisions below shall be applied to the voicebank, Joule. For more details, please refer to the readme.txt provided in Joule's voicebank(s).

  • R-18 Content Allowed? Yes.
  • Commercial Use of Voicebank Allowed? No.
  • Commercial Use of Character Allowed? With permission from WanderJoule.
  • Do these terms apply to derivative characters/voices? Yes.


  • Joule is Canadian, just like their voice provider.
  • Joule's original name was Conny. A reference to the creator's real name.
  • "Joule" is actually just a nickname. Their real name is James Joule
  • In his old design, they wore a blue jacket that many mistook for a blazer.
  • Joule has crippling stage fright.



External links

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