Kagamine Rin & Len

Released on December 27, 2007, Kagamine Rin/Len (鏡音リン・レン, Kagamine Rin/Len?) is the second installment of the Vocaloid Character Vocal Series, a brother (Len) and sister (Rin) twin pair. Their family name was chosen by combining Kagami (鏡, Mirror?), Ne (音, Sound?), with the first syllables of their given names a pun on "Left" and "Right". According to Vocaloid's official blog, the package includes two voice banks: one for Rin and another for Len, both provided by the seiyū Asami Shimoda. Despite the double voice banks, the package still sells at the same price as Hatsune Miku.[11]

On June 12, 2008, Crypton announced the updated edition, named "act2", will be released in early July 2008. Users who had bought the old version will get a expansion disc free of charge. On June 18, 2008, beta demonstration songs using the new version were released on the company's official blog.