"SF-A2 Development Code Miiki" is a VOCALOID produced by faithfully reproducing the live voice of the artist "Furukawa Miki".
There are different character variations between treble, midrange, and bass range, and different characters, and exhibits a wide range of expressions and charm.
The "VOCALOID4 Miki Natural" has been added to the "VOCALOID2SF-A2 development code miki" with the new function "Growl" and a more natural power source for VOCALOID4.