Crypton released the first of their "Character Vocal Series", Hatsune Miku, on August 31, 2007.
On April 30, 2010, an updated version of Miku called Hatsune Miku Append was released containing a package of six different tones of Miku's voice:
- Soft (gentle, delicate voice)
- Sweet (young, chibi voice)
- Dark (mature, heartbroken-like voice)
- Vivid (bright, cheerful voice)
- Solid (loud, clear voice)
- Light (innocent, heavenly voice)
Hatsune Miku Dark Append - Hirari, Hirari
Source: Wikipedia

