Before revision: Although a schwa-like quality [ə:] , appears to be the most commonly used, some speakers consistently using the neutral vowel [ɨ:] instead, and others use both vowels in the same sentence, depending on the quality of the previous word last vowel.
After revision: Although a schwa-like quality [ə:] , appears to be the most commonly used, some speakers consistently using the neutral vowel [ɨ:] instead, while others may use both vowels in the same sentence's depending on the quality of the previous word last vowel.