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Kasane Teto

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1408676310 electronics
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1408676310 electronics
Kasane Teto
  • Kasane Teto Official Art
  • Alternate Official Art
  • Fanwork by CAFFEIN
  • Fanwork by CAFFEIN
Biographical information



31 (official age)[2]
15.5 (Fan age for human design)


5'2" / 159.5cm


103 lbs / 47kg

Product information





Mayo Oyamano


Sen (線)




denizens of vip@2ch
Crypton Future Media
YAMAHA Corporation

Kasane Teto (重音テト) is a Japanese UTAU who was originally created as a troll "VOCALOID" by fans. Her surname 重音 (Kasane) means "Piled-up Sound." Her name テト (Teto) comes from Tetopettenson, a parody song of Le Beau Tambour. Although her voicebank is only for use in UTAU, many people still mistake her for a VOCALOID.


Following the rising popularity of Hatsune Miku, "Vippers" (Vip News Bulletin@2ch users) schemed a troll "new VOCALOID release" as an April Fool's joke. Sen (線) provided the rough sketch and Nobuyo Oyama, a spoof for Doraemon's former voice actress Nobuyo Ohyama, provided the vocal. The Teto project continued after the troll campaign, and her vocal was recorded again for the use on UTAU, which vocal synthesis software was released two months earlier. UTAU and Teto were both unnoticed among VOCALOID composers at first, but during the last half of the year of her release several creators started composing songs for Teto, causing her fame to be established during following year. The voice provider's name reading was then changed to Mayo Oyamano (小山乃 舞世 Oyamano Mayo) to avoid unnecessary confusion.

Teto was given official acceptance to piapro on April 1, 2010, and to Project DIVA on October 10, 2011.

Impact on VOCALOIDEdit

The first cover song using Teto was created as early as on April 6 of the year, and her signature song "Mimi no Aru Robot no Uta" was published on June 10 by Mimirobo-P. Since then several creators including Lamaze-P, Telmin and Death Ohagi started to create Teto songs. Some of these early works are "Fake Diva", "Triple Baka", "Kasane Territory", and "Popipo MkII".

This trend changed on August 1, 2009, when UTAU was updated and VCV voicebanks became available. Teto's VCV voicebank was released on October 20, 2009 and her singing became more natural than before. This evolution made more DAW users turn their eyes towards Teto. Many Teto songs were posted to Niconico, and Teto and UTAU established the place among VOCALOID.


Users of UTAU must always be aware of the licensing behind any UTAU voicebank they use and Teto is no exception to this rule. For example, websites labelled as "TheOfficialTeto..." are plagiarizers if the owners did not have permission from team TWINDRILL, therefore users should be wary of fakes.

Guest AppearancesEdit

Kasane Teto, Hatsune Miku and Arisa Mitsuko were illegally used in a concert held at TNT Expo in Mexico on August 20-21, 2011, as the organizers used her image without permission from TWINDRILL. TWINDRILL is handling this privately due to the illegal usage of Teto's image.

Voicebank LibrariesEdit

Product Information
To our readers and editors: For section notes, please read Wiki notes:Voicebank Libraries sections.
  Genre: Pop, Anison  Tempo: 70~150 BPM  Range: A#3~E#5
Package details
Teto is held under license by Team TWINDRILL and usage of her image and voicebank must comply with their licensing agreement. Her initial release is BOUCALOID on April 1, 2008 with triphones on September 17, 2011, and her second release is BOUCALOID APPEND on October 1, 2012.
Vocal traits as noted:

As noted:

  • Original and Expansion downloads
  • Diphone, Triphone, Appended
  • Append, Whisper, RIKIMI, SAKEBI
  • SAKEBI voicebank make Teto sing higher notes with more realistic results
Software issues as noted:
  • Needs an special surfix to get Whisper voicebank working
  • Western users may need to convert voicebanks to romaji

Additional informationEdit


Kasane Teto Popularity
To our readers and editors: For section notes, please read Wiki notes:Popularity sections.

She can be downloaded for free from her website. She is also the regarded as one of the most used UTAU in Japan, if not the most used.


Since her first voicebank release, Kasane Teto have received a very positive response from the public. Kasane Teto has more than 20.000 videos starring her at NicoNico.


She is regarded as one of the primary reasons UTAU became popular due to her infamy as a fake and fame as a character. Her fame lead to the raise of the UTAU "Vipperoids".


She has made guest appearances in official VOCALOID media by Crypton Future Media such as Project Diva. In fact, because of her fame and constant guest appearances alongside VOCALOIDs, she has been often been mistaken as a VOCALOID.


  • She is recognized as the first UTAU with a recorded voicebank, as Utane Uta's is borrowed from AquesTalk Female-1, which is machine synthesized.
  • She, Momone Momo and Utane Uta were refered to as the "3 UTAU Girls", due to their fame.

Notable for...Edit

  • She is the first VIPPERloid.
  • She is the first UTAU character to appear in the Project DIVA videogames.
  • She is the first "non-VOCALOID" character that is licensed by Crypton Future Media to be in a Project DIVA game.



  1. Q&A 性別がキメラってどういうこと?
  2. Q&A テトは本当に31歳なの?人間に直すと年齢は半分になるの?

External linksEdit

Official :

Other :

Fandom :


Start a Discussion Discussions about Kasane Teto

  • "But Teto DESERVES to be a vocaloid >:(!!!!!!!!!1"

    160 messages
    • ShyTomato wrote: wrote:if she becomes a Vocaloid, she will have to leave Uta/Defoko and Momo, her best friends.  Well, I do...
    • Macne Nana still has her old vocals and her old vocals were offered alongside the new Vocaloid vocals when she went on sale. This factored al...
  • Teto should become a VOCALOID while still remaining an UTAU

    14 messages
    • ^Bare in mind, that Macne Nana Vocaloid version sounds closer to what Nana was intended to sound like in Garaband and Reason. Actually this ...
    • ^ Not to mention it'd depend on how the company handled her. For instance, when KAITO was being upgraded to V3 due to the vast difference...

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