Talk:VOCALOID3/@comment-50.10.239.251-20140116045115/@comment-53539-20140116100635

When you buy the V3 editor, you can select what language to install it as.

Its different in V2, as whichever language you bought the vocaloid as you were stuck with. So buying Japanese Vocaloids (Luka counts) meant you got the interface in Japanese, English vocaloids gave the English interface. It was possible to remove the Japanese files to make Japanese English, but not to make English Japanese, as the Japanese language files were added on, whereas English was the default.

Either way, installing one language for the engine does not prevent you using vocaloids of other languages. Do note that if you don't actually speak the language you are using, then you won't know when the Vocaloid is slipping up. So be wary of buying say, for example, chinese vocaloids if you don't know Chinese at all.