How to emit a custom sound on iPhone

I'm working on a game where a proximity detection for nearby objects will take a great role. I'd like to have it emit a sound when getting close to the obstacle - a sound of a cust开发者_开发问答om tone / volume... I could probably prepare samples of sounds for that, but a custom sound of a custom tone and volume for each of the earphone played.

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See the OpenAL wrapper sound manager HERE.

That allows you to set the actual position of the sound, which will affect the volume in a 3 dimensional way.