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This utility is used for recording yourself and comparing your pronunciation with a native speaker.
Click the "Record" button and you will hear and be shown the word to speak , when you are given the cue "Speak Now", say the word and then click the OK button. The next word will be automatically played until you click "Stop" or until all words in that category have been played.
This is also an excellent way of putting you under pressure to speak which of course is what happens when you first start to converse in a foreign language.
You can not delete single words but you can record over the top it which has the same effect.
You can delete all your recordings in a category by clicking Recordings > Delete All from the toolbar at the top.