Template:Tonio V2 voicebank

Tonio has a range from baritone to Tenor and is intended to be a partner to Prima whom he is best suited as a vocal partner to and compliments her vocals well.

Tonio favors the lower octaves. However, despite being focused on a baritone to tenor vocal, he is capable of going much higher without suffering as much as other male Vocaloids. Like Prima he is also considered amongst one of the more professional aimed Vocaloids.

Tonio does not possess the same engine version of Vocaloid 2 as Big Al, who possesses the next version of the software. While he does not have the final edition of the Vocaloid 2 software (VY2 has this version), Tonio had a few additions that patches some flaws in older Vcaloid 2 versions. For example, Tonio's software plugin can be used to fix several issues related to his partner Prima's installtion, which has problems with 64-bit Windows 7 OS.

Pronunciations related to the letter "r" in the english alphabet may not sound well for Tonio, as he tends to be flat. The word "singer" for example (see sound sample below). Some notes may also be muffled, so its best to pay attention to his phonetics when users have him sing. Tonio is more robotic sounding and less natural than Prima. Notes shorter then a single whole note may be difficult for him. When the word "Sacred" is broken up into two half notes, he will only pronounce the ending half ("Cred") and leave the first half out ("Sa"). Moving the notes to another track may or may not resolve the problem. Otherwise he shares Prima's problem of being ground to the classical style of music vocal and is difficult to tweak into other styles. He has no breath samples.

In December 2010, Sound on sound writer Tom Flint gave Tonio only 3 out of 5 stars, less then Sonika's review in March 2010 (who recieved 4 out of 5 stars). Part of the problem was owed to how strange Tonio's opera-based voice became with editing, and can be quote as saying how they "just sounds odd when coloured with an electronic effect". Flint felt that perhaps Opera wasn't the best choice for Vocaloid, stating the issue is that the Vocaloid software makes it too robotic to sound natural and less useful.