Realtime filtering for OpenAL

Hello, 

I'm writing a "realtime" filtering module to implement a vocoder later. 
The point is that the filters frecuency behaviour seems to be almost right
but I'm getting a lot of noise when applying them.

I'm using an IIR DTF-II filter with 3 biquad sections, in order to avoid
overflow, running over the capture with queue routine for openAL. 

The program is returning noise even with the windows recording level set to
zero. But it returns no output when I fill the input vector with 0's.

The question is, does anybody knows a realtime IIR filter code write in C++
for using with OpenAl?

Any suggestions and answers will be appreciated.

Thanks!
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