Half-Close Vowels (Second Degree of Aperture)
You can hear each sound by clicking on his IPA transcription.
Half-Close Front Vowels
Half-Close Central Vowels
Central vowel (half-close). In reality, this vowel (schwa) falls between the second and third degrees of aperture. This articulation is considered neutral from the point of view of lip-rounding as well (neither rounded nor unrounded).
Half-Close Back Vowels
Unrounded half-close back vowel. Warning: do not confuse this symbol (small gamma) with that of the voiced velar fricative (large gamma).