The English phonetic system includes 10 vowels of the 11 monophthongs or pure vowels of the English Language, missing the phoneme /ɑː/ or open unrounded vowel.

The pronunciation of some vowels may change slightly, depending on the dialect or the way the Vocaloid was recorded.

  • Example: Oliver's [{] phoneme has been reported to sound more like an /a/ than an /æ/.

Also the target or optimal musical genre of the Vocaloid can affect the pronunciation of the vowels:

  • Example: Tonio & Prima had been reported to have an "opera" like pronunciation of the vowels, more fitting for romance languages than standard English. This probably is attributed as they're Opera specialized voicebanks.

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