AudioServicesPlaySystemSound not playing sounds

Question

I am playing a small .wav file using the AudioToolBox.

AudioServicesPlaySystemSound (soundFileObject);

But sometimes it is not playing.

Answer 1

For those who visit this question later,

AudioServicesPlaySystemSoundID()'s volume is based on system Ringer in range of 0.1 ~ 1.0, not mediaVolume

AudioServicesPlayAlertSoundID()'s volume is based on system Ringer in range of approximately 0.3 ~ 1.0