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I get my recording application working with a GSM codec with 8KHZ frequency,  
but i cannot get it working with any other frequency.  
 
Anyone out there please please help me out!  
The following is the wave format struct i passed in:
 
 
// 8KHZ -- this works
pgsmwavefmt.wfx.wFormatTag = 0x0031;
                pgsmwavefmt.wfx.nChannels = 1;
                pgsmwavefmt.wfx.nSamplesPerSec = 8000;
                pgsmwavefmt.wfx.nAvgBytesPerSec = 1625;
                pgsmwavefmt.wfx.nBlockAlign = 65;
                pgsmwavefmt.wfx.wBitsPerSample = 0;
                pgsmwavefmt.wfx.cbSize = 2; //Double word cbsize contains  
wSamplesPerBlock
                pgsmwavefmt.wfx.wSamplePerBlock = 320;
 
 
//
// 11.025 KHZ -- this doesnt work
// gives me a incorrect format error
 pgsmwavefmt.wfx.wFormatTag = 0x0031;
                pgsmwavefmt.wfx.nChannels = 1;
                pgsmwavefmt.wfx.nSamplesPerSec = 11025;
                pgsmwavefmt.wfx.nAvgBytesPerSec = 2239;
                pgsmwavefmt.wfx.nBlockAlign = 65;
                pgsmwavefmt.wfx.wBitsPerSample = 0;
                pgsmwavefmt.wfx.cbSize = 2; //Double word cbsize contains  
wSamplesPerBlock
                pgsmwavefmt.wfx.wSamplePerBlock = 320;