Why does audio work in the simulator but not on my iPad?

I am working on creating a very simple app. 2 buttons, both play sound. Each clip lasts 1 second and responds to "TouchUpInside". They are .caf files that I converted in iTunes.

Here is my code, once again, it works in the simulator but not on the device:

enter code here- (void)viewDidLoad {

    NSLog(@"InView did load");

AudioServicesCreateSystemSoundID ((CFURLRef)[NSURL fileURLWithPath:[[NSBundle mainBundle]pathForResource:@"bigaif" ofType:@"caf"]], &systemSoundID);


    AudioServicesCreateSystemSoundID((CFURLRef)[NSURL fileURLWithPath:[[NSBundle mainBundle] 
                                                                   pathForResource: @"smallwav" ofType:@"wav"]],                                                            
                                                                    &systemSoundIDTwo);

}

-(IBAction) playSound:(id) sender {
AudioServicesPlaySystemSound(systemSoundID);
}
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-(IBAction) playSoundTwo:(id) sender {
AudioServicesPlaySystemSound(systemSoundIDTwo);

}

After looking for errors in my code for the past 30 min I found that the mute button on the side of iPad was on. Check that before trying some fancy solution.

30 min well spent...

I found my answer. I was using SystemSound and what do you know, I had my system sounds muted in my device settings.

I had same issue. I didn't add a link reference to the AudioToolbox.framework but it still worked on simulator. I added it and it played in the foreground of my app on the device.

Then I wanted it to play the sound in the background. In info.plist "Required background modes" add the key "plays audio". That got it working the background.

This happened to me as well. Sounds were playing just fine in the simulator, but not on the device. I tried to play the sounds multiple different ways. I used both SystemSound and AVAudioPlayer with the same results. I even downloaded the code from a Mobile Orchard tutorial, and had the same result. Code example worked fine in simulator, but wouldn't play on the device.

After 2 hours of this, I double-tapped the home button on the iPad, scrolled to the left to the sound controls, and then tapped the speaker icon on the left. That placed a slash through the speaker icon to indicate that system volume was muted. I then tapped again, the slash went away, and I was then able to play sounds through the device.

So basically, I had to toggle through the muted state of the device using this method and that reset something on the iPad to where I could hear the sounds.

Note that this was on iOS6.