This website was created to help people improve their American English pronunciation. At the core is a series of videos explaining in detail how each sound is created, as well as a blog.
If you want more information on the photos in this video, which have parts of the mouth drawn in, see this video on the parts of the mouth.
How to make this sound:
This entry is in response to a question I received via email. It deals with a variation on the schwa that also exists as a reduced vowel. The paper referenced in this post can be downloaded here. It is a paper by Edward Flemming from MIT and Stephanie Johnson from Stanford.
Take a look at how the mouth position changes on the different vowels:
How to make this sound:
Video Text: