[Speex-dev] AGC control and how to echo cancellation?

[=?ks_c_5601-1987?B?vNW9wr/4?=]

Hi, all.
 
When AGC enabled, I can hear echo and electronic noise. (in newest svn version)
In my thought the computed gain value is too big.
Which value exactly can affect to max boost level?
 
And I want to implement the echo cancellation.
Is there any example?
 
Forgive my poor question.
Thanks.
 
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