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    <p>In my <code>- (void)setUpAudio</code> method I have created a dictionary which holds the settings for the AVAudioRecorder.(It's a bit cleaner) Your code above is almost correct, but not quite. See below. </p> <pre><code>// empty URL NSURL *url = [NSURL fileURLWithPath:@"/dev/null"]; // define settings for AVAudioRecorder NSDictionary *settings = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithFloat: 44100.0], AVSampleRateKey, [NSNumber numberWithInt: kAudioFormatAppleLossless], AVFormatIDKey, [NSNumber numberWithInt:1], AVNumberOfChannelsKey, [NSNumber numberWithInt:AVAudioQualityMax], AVEncoderAudioQualityKey, nil]; NSError *error; // init and apply settings recorder = [[AVAudioRecorder alloc] initWithURL:url settings:settings error:&amp;error]; // This here is what you are missing, without it the mic input will work in the simulator, // but not on a device. AVAudioSession *audioSession = [AVAudioSession sharedInstance]; [audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:nil]; if (recorder) { [recorder prepareToRecord]; recorder.meteringEnabled = YES; NSTimer *levelTimer = [NSTimer scheduledTimerWithTimeInterval:0.03 target:self selector:@selector(levelTimerCallback:) userInfo:nil repeats:YES]; [recorder record]; } else { NSLog([error description]); } </code></pre> <p>Then in the update method you can keep track of your mic input levels like this. </p> <pre><code>- (void)levelTimerCallback:(NSTimer *)timer { [recorder updateMeters]; NSLog(@"Average input: %f Peak input: %f", [recorder averagePowerForChannel:0], [recorder peakPowerForChannel:0]); } </code></pre> <p>Any questions or ways I can improve my answer please let me know. Still pretty new around here. </p>
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