Anti-buzz application

[arne anka]

did you ever check in a statistically valid way, if your approach works?
as i understand from the long-term discusions, consensus is, that the only  
way to remedy the buzz are hardware fixes.
no fiddling with mixers in what dimension ever is going to solve that  
basic issue.

since the buzz is, iirc, related to the tx power of the fr, depending on  
your situation you might reach a compromise between sound quality and buzz  
suppression, that satisfies your needs -- but that does not help, if your  
situation worsens, soon the call quality declines to a level inacceptable  
even for the most hardened.