- 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.
Updated March 31, 2017
Many vocaloids have been made in America, such as Dex, Diana, Avanna, Oliver, Ect.
It has been dubbed as Vocamerica