Sounds in Words App is designed to assist people to learn how to pronounce most frequently used words.

How to use Sounds in Words App.
Select a word. Symbols corresponding to the number of sounds in the word will appear in the the two buttons. Press either button to hear a sequence of sounds which make up the word. Lower button will play every vowel equally stressed. Upper button will only stress the dominant vowel.
If additional small buttons appear, then the word can be pronounced in more than one accepted way. Select each alternate small button to hear the alternative pronunciations.

Currently the Sounds in Words App contains over two thousand words most used in the English language.

Since English language has many dialects, the most widely understood English dialect was chosen for this App. This is the dialect of Hollywood films and sitcoms.

R controlled sounds are limited to 'er' while the others are divided in to separate vowel and a 'r' sound.

This App has been tested with wired headphones and the iphone’s internal speaker.

Also, there's a possibility that the App could contains some slight errors.