If you are developing a game probably you need to add sound to your app.
As many other things, although Apple offers you a library to manage the audio, Cocos2D has it's own class: SimpleAudioEngine. It makes you really easy to insert background music and sound effects. It also allows you to modify basic properties such as pitch, pan and gain, and the possibility of looping a sound.
You can preload the sound (if you have a lot and heavy sounds). For loopings you need a CDSoundsource class:
Playing effects and background is very easy:
Setting other properties is also easy:
Playing around with looping sounds:
