Have few short sound effect samples, which play just fine in emulator, but not at all in real iPhone 3GS. Here's the code, about as-is from Apple SysSound sample:
CFBundleRef mb = CFBundleGetMainBundle ();
CFURLRef soundFileURLRef = CFBundleCopyResourceURL
(mb, CFSTR("mySound"), CFSTR ("caf"), NULL);
SystemSoundID sid;
AudioServicesCreateSystemSoundID(soundFileURLRef, &sid);
AudioServicesPlaySystemSound(sid);
When using iPhone, I can hear keyclicks and music from iTunes (not trying to use at same time as playing my sound) - but cannot hear my sound at all. Vibra works ok, so even Framework should be set up correctly.
Tried even the SoundEffect.h/m sample code, no change. Used same sound files, but shouldn't CAF be ok, especially when it plays in emulator?
What can I try next?
Try converting to a different format such as wav or mp3, then play again. If you want to use caf, Make sure you are formatting the caf correctly in Terminal.app:
afconvert -f caff -d ima4 mysound.wav