void mixer::mix(sample::ptr a_Sample, sample::ptr *a_Result){
        sample::value_type *l_Left   = a_Sample->buffer();
        sample::value_type *l_Right  = a_Sample->buffer();
        sample::value_type *l_Output = (*a_Result)->buffer();

        float l_PanValue = std::min(1.f, std::max(-1.f, a_Sample->pan()));

        sample::value_type l_PanLeft  = 1 - ((l_PanValue + 1) / 2);
        sample::value_type l_PanRight =      (l_PanValue + 1) / 2;

        float l_MagicValue = 5.f;

        // correct right channel for interleaved format
        l_Right += a_Sample->channels() - 1;

        for(int i = 0; i < a_Sample->count() / a_Sample->channels(); i++){
                float l_Volume = a_Sample->volume() * m_MasterVolume / l_MagicValue;

                *l_Output++ += *l_Left * l_PanLeft * l_Volume;
                *l_Output++ += *l_Right * l_PanRight * l_Volume;

                l_Left  += a_Sample->channels();
                l_Right += a_Sample->channels();
        }
}