OLIVER is an English VOCALOID developed and distributed by PowerFX Systems AB. in collaboration with VocaTone, and was released in December 2011 for the VOCALOID3 engine. OLIVER's vocals are "based on a 12 year old boy soprano", a choir boy. His voice provider is from Britain, and during the time of recording, he was 13 years of age. Therefore, the identity of his provider has never been revealed for legal reasons. He is the first young male VOCALOID whose voice samples were not produced by an adult.

(Source: Vocaloid Wiki)

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