However, there are many French words wherein the au vowel sound is pronounced like an English long o sound, e.g.:
- au (to the)
- chaud (hot)
- gaufre (waffle)
- haut (high)
so it seems clear to me that the vowel sound in jaune should be pronounced similarly.
This Frenchman said that many people from the Marseille region in France use this "mistaken" pronunciation, although he would classify it more as a regional variant. Personally, I will try to break my longstanding "mistake", since I prefer to emulate standard Parisian French, and I will make enough other mistakes trying to do so!