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In this lesson you’ll build the Voice Recorder app, which allows the user to record sounds using the iPhone’s microphone. You will learn to record audio files using an AVAudioRecorder and the AV Foundation framework, verify text input using an NSPredicate object and a regular expression, use metering to create a visual representation of the user’s audio input, and create an NSData object representing an audio file and use an MFMailComposeViewController to send an e-mail with the recording attached.