English Phonetics/Diphthongs

The English phonetic also includes an array of diphones 5 diphthongs: 3 [j]-colored vowels and 2 [w]-colored vowels. Although useful, the diphones tends to cause some problems for the user when they need to be extended or split in two notes. However this isn't an issue anymore in Vocaloid3, as the phoneme [-] allows to extend diphthongs across various notes.

Also is important consider the diphthongs can have pronunciation differences depending the dialect of the voice provider for the chosen voicebank and the way how they were recorded.