The English phonetic also includes including 6 r-colored or rhotized vowels. These ones are used mainly used for the vowel + R combinations. These vowels are modified by the R that follows them, incorporating to them and forming a single unit, as it's in the case of the diphthongs.

Like the diphthongs, these ones tends to vary in their pronunciation, specially if the voice provider has a rhotic accent or not.

  • Example: Depending the speaker's dialect and context of the sound, the VOCALOID phoneme [I@] may be realized as [ɪː] (non-rhotic, long vowel), [ɪə] (non-rhotic, schwa diphthong), [ɪɚ] (rhotic; r-colored schwa diphthong), [ɪɹ] (rhotic; vowel-consonant), etc.
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