Speex dev - Jan 2009 - Regarding : Document for Automatic Gain Control for a speex module

Dear Sir,
I am fresher for DSP domain. Currently I am working on  implementing automatic
gain control part. I refered public domain free source code for speex module.
It's very useful for me, but I did not get exact document that what document
they followd for control the gain automaticaly for a noise cancellation module.
For this I did not get documents properly. So kindly suggest me which document I
need to follow for fixing gain automatically for noise cancellation module or
speex module.

Thanks in advance

Regards, 
Baskar.C
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