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: