Using this Phoenician letter for a vowel audio is mainly because of the early Greek alphabets, which adopted the letter "omicron" to represent the vowel /o/. The letter was adopted with the value during the Aged Italic alphabets, such as the early Latin alphabet. Spotify is unavailable on this https://lorenzoekopt.blogsvirals.com/36082292/everything-about-o-sapinho-e-a-borboleta