- Answered October 5, 2011
One has not been confirmed.
However, Big Al's voice provider was American.
- Updated October 22, 2011
A Vocaloid3 named Oliver was created by collaboration between a company(VocaTone) in Utah America and PowerFX a company in Stockholm Sweden. This is about as close to an American Vocaloid that America has gotten in 7 years.
However, neither company has informed the fandom of the Vocaloids true origin.