Kasane Teto
Kasane Teto (Japanese: 重音テト, pronounced [kasane teto]) is a virtual singer software (known as a voicebank) created on the Japanese textboard 2channel for April Fools' Day, 2008. Although the software was initially created as a hoax and did not exist, it later was actually produced and made compatible with singing voice synthesis software UTAU, allowing it to sing. Teto was introduced as a "diva born from a hoax".
Kasane Teto was also released as a voice model in 2021 for TALQu, a deep learning-based free speech software, and in 2023 for Synthesizer V AI, a commercial singing voice synthesis software. On 1 April 2025, AH-Software announced an adaptation of Kasane Teto's voice for their VOICEPEAK text-to-speech software.
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