Sound system Vowels CHOICE

For CHOICE, the current speaker uses the diphthong [ɔɪ​]. However, Turner observes use of the diphthongs [ɐɪ] and  as options for similar words (1971: 125–126; 2002: 21). Turner cites words such as boil, join, and boy, which he describes as having the surface diphthong [aɪ​], with the nucleus advancing from an underlying [ɒ]. It appears, however, that this group of words undergoes a nucleus shift to [ɐ] in pre-voiceless environments, comparable to that observed in words such as die, mine, and side.