Board Thread:General Discussion/@comment-3076833-20130904234533/@comment-53539-20130905074620

The multilingual thing was discussed before on VO forums, it would take a number of years to record such a vocal and due to the register would be awkward. The vocal library size needed would be huge... And would end up using every kind of sound possible for the human vocals, from whistling to talking.

Its not impossible but it is regarded as impractical, even if size was no the issue, money would be and finding a vocalist capable of getting every sound. Its easier for software like Cantor to do this kind of thing since its not sample based. Also... The number of possible errors and glitches presented in such a vocal is huge... How do you test this kind of vocal?

It would also mean a huge rewrite of the vocaloid software itself.

In short, there is a reason why so far we've only seen 1 or 2 vocals max per language... There is also a issue CFM brought up that they'd only make other languages for Miku if the result still sounded cute. Due to the vocals having to sound out the language needed sounds, the voice will "change" tone either on purpose or indirectly, producing different results. I pointed out on VO forums, Miku herself right now sounds like she is moving her jaw left to right as she sings in English.