Since her adoption for Project DIVA in 2011, Teto has had several unusual chances for a non-VOCALOID vocal synthesizer character to appear in media. Many Teto songs were posted to Niconico, and Teto and UTAU established a place among VOCALOID. This evolution made more DAW users turn their eyes towards Teto. Teto's VCV voicebank was released on Octoand her singing became more natural than before. This trend changed on August 1, 2009, when UTAU was updated and VCV voicebanks became available.

Some of these early works include 'Fake Diva', ' Triple Baka', 'Kasane Territory', and ' Popipo Mk-II'. Since then several creators including Lamaze-P, Telmin and Death Ohagi started to create Teto songs. The first cover song using Teto was created as early as April 6, 2008, and her signature song ' 耳のあるロボットの唄 (Mimi no Aru Robot no Uta)' was published on June 10 by Mimirobo-P. Teto was given official acceptance to piapro on April 1, 2010, and to Project DIVA on October 10, 2011. The voice provider's name reading was then changed to Mayo Oyamano (小山乃舞世 Oyamano Mayo) to avoid unnecessary confusion. 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 the following year. 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. Sen (線) provided the rough sketch and Nobuyo Oyama, a spoof for Doraemon's former voice actress Nobuyo Oyama, provided the vocal. Following the rising popularity of Hatsune Miku, 'Vippers' (Vip News users) schemed a troll 'new VOCALOID release' as an April Fool's joke.

Kasane teto english download