Hatsune Miku
, sometimes referred to as Miku Hatsune, is the name of a Vocaloid software voicebank developed by Crypton Future Media and its official moe anthropomorph, a 16-year-old girl with long, turquoise twintails. She uses Yamaha Corporation's Vocaloid 2, Vocaloid 3, and Vocaloid 4 singing synthesizing technologies. She also uses Crypton Future Media's Piapro Studio, a singing synthesizer VSTi Plugin. She was the second Vocaloid sold using the Vocaloid 2 engine and the first Japanese Vocaloid to use the Japanese version of the Vocaloid 2 engine. Her voice is modeled from Japanese voice actress Saki Fujita. Miku's personification has been marketed as a virtual idol and has performed at concerts onstage as an animated projection (rear cast projection on a specially coated glass screen).
Vocaloid 2
Crypton Future Media had produced vocals for this version of the software Renders of the beta vocals could be heard in various mediums. Meiko was used in the song on the album . Originally, the song used Meiko's original Vocaloid vocal. Luka's Append vocal was used on the album for the song "Hoshizora to Yuki no Butōkai (Zeal mix)". The promotional album "Vocalo Append" used a beta of Luka's "Soft" Append. Miku's English vocal in particular was low quality and was not released in the engine for this reason. The vocals were announced to have been dropped in favor of Vocaloid 3 productions on December 1, 2011. Songs using the beta versions also featured in "".