How to reinstall audio

for a mac book air with snow leopard operating system?

Not familiar with MacBook Air's but didn't they come with a OS X  USB key with Snow on it?
You (I think) option boot or c boot off of that, and chose the option to simply install OS X, it will ovrwrite the installed version with a copy from the USB, installing the audio with it.
then you (gulp) use the Software Update to get current (take your chances my friend)
Please backup your files first
https://discussions.apple.com/message/16276201#16276201

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    Signature:
    I currently work on behalf of HP for numerous support departments. The opinions expressed above are the personal opinions of myself, not of HP. There is no guarantee that the opinions expressed are 100% correct.

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