Spectrum analyzer - mouth movements

Hi,

I came to a problem, which I can't resolve by myself, that's why I'm asking
here. I need mouth movements( byte 0 - 255 (255 - opened mouth, 0 - closed)
which should be controlled by current spectrum / cur. frequency of actual
byte/sample offset. For now, I've done this:

alGetSourcei(m_pActiveSamples[i]->Source, AL_BYTE_OFFSET, &iOffset);
ErrorCheck();
		
if(m_pActiveSamples[i]->pCache->nBitRes == 8)
        iMouthOpen = *(m_pActiveSamples[i]->pCache->pSampleData + iOffset);
else
	iMouthOpen = *(m_pActiveSamples[i]->pCache->pSampleData + iOffset * 2);

pSample data is data chunk from wave file. But mouth movements are weird and
I don't know how to "clean" them. So I'm asking if somebody knows how to
resolve this.

Thanks,
Richard Rohac.
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