

The reason for the lower rating, however was listed as opera "just sounds odd when colored with an electronic effect" and Flint felt that perhaps Opera wasn't the best choice for the Vocaloid franchise.

When reviewed by Sound on Sound writer Tom Flint Tonio was given only 3 out of 5 stars, less than Sonika's review in March 2010 (4 out of 5 stars). Like other Vocaloid 2 Zero-G and PowerFX vocals, he would later be released in Taiwan by E-Capsule. After delays he was released on July 14, 2010. Tonio was first announced at the NAMM trade show and was set to be released back in early February 2010. Tonio's vocalist came from the Royal Northern College of Music. He was aimed at professional producers of music. Tonio was developed as the male counterpart to a previously released vocal from Zero-G, " Prima", and designed to be used for classic-style singing such as opera.
