This folder contains prerecorded audio files for letters of the alphabet.
These audio files are in http://cafe.bevocal.com/libraries/audio/female1/en_us/alphabet/.

The as_in subfolder contains prerecorded audio files for phrases such as "a as in alpha".
These audio files are in http://cafe.bevocal.com/libraries/audio/female1/en_us/alphabet/as_in/.