OpenAL tone generation on iPhone

So I have been looking around for some time now on a way to produce a variable tone on the iPhone using OpenAL, the issue being the Apple ha开发者_如何学运维s deprecated the ALUT part of OpenAL that has the alutCreateBufferWaveform that would be perfect for this. I was wondering if anyone had any idea how to make a tone generator using OpenAL on the iPhone SDK. All I need is the ability to produce a certain frequency tone consistantly over and over again.

This is a last resort so sorry if it sounds kind of stupid.

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This isn't exactly what you are looking for, but it can create a similar effect.

I used this tutorial

http://benbritten.com/2008/11/06/openal-sound-on-the-iphone/

to create an engine that could play a prerecorded sound at different levels. So even though I have to play the sound from an existing *.caf file, I can modulate the pitch and control looping so it produces any frequency, length, or volume I'm looking for.