How Can I Execute Ezaudio In Background

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Mobile

iPhone

iOS

I want to display waveform when I record the audio.I have use the EZAudio class but it will crash when I press HOME button or SWITCH OFF.

I tried.

__block UIBackgroundTaskIdentifier task=0;
task=[application beginBackgroundTaskWithExpirationHandler:^{
    NSLog(@"Expiration handler called %f",[application backgroundTimeRemaining]);
    [application endBackgroundTask:task];
    task=UIBackgroundTaskInvalid;
}];

i have also change in info.plist file
Required background modes - App plays audio or streams audio/video using AirPlay

How can I execute the app in background please help me.
Thenx in advance.