Here are a few other features that make SpokenText stand out:
Choose from several voices, including male and female
Translate English text to spoken French or German
Choose the number of spoken words per minute (although if you set this too high, the recordings will sound awful)
Save files in MP3 or M4B formats
You can also share recordings with other users by sharing your URL or embedding an audio player on your web site.
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http://www.spokentext.net/