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Iphone - AVAudioRecorder provides monaural playback (audio playback in just one channel)

I use AVAudioRecorder to record sound and save to a wav file (using SDK 3.0). The settings dictionary contains the following values

    NSMutableDictionary *recordSetting = [[NSMutableDictionary alloc] init];

    [recordSetting setValue :[NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey];
    [recordSetting setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey]; 
    [recordSetting setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey];

    [recordSetting setValue :[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
    [recordSetting setValue :[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];
    [recordSetting setValue :[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey];

Even after specifying the number of channels as 2, the playback is mono (i.e., playback in only 1 ear jack instead of both channels).

Has anyone else encountered this problem? Is there something wrong with the recordSetting dictionary values?

thank

Can someone help me with this ... If I specify the number of channels as 2, why will the playback be in one slot? (I use headphones for testing - the ones that come with my iPhone)

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[recordSetting setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey];

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