American Accent Training
Schwa /ə/
A schwa is a vowel sound in an unstressed syllable, where a vowel does not make its long or short vowel sound. It usually sounds like the short /u/ sound, but is softer and weaker. The schwa sound is the most common vowel sound - and the only speech sound with its own special name.
NOTE The sound /u/ is not like the Spanish "u". In English, /u/ sounds more like a Spanish "a", as in the words umbrella, unfinished, or understand.