[Speex-dev] About dereverberation options?

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

Hi all,
 
I've add SpeeX to my VoIP program for 16kHz codec. (based 1.0.5 version)
And I ported preprocessing of 1.1.11.1 version in addition.
Here I have one question about dereverberation level and decay value.
 
The default value of level/decay is 0.2/0.5. But dereverberation using default setting is hard to feel improvement.
Is there any better settings?
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