//buffer (IntPtr) contains the PCM data in 32-bit floating point samples
        //length (int) is the number of bytes to process

        Complex[] cOutput = new Complex[length/4]; //allocate the buffer to store the complex numbers
        float* data = (float*)buffer;
        for (int i = 0; i < (length / 4); i++)
        {
            cOutput[i] = new Complex((double)data[i], 0.0); //fill the Complex array
        }

        Fourier.Forward(cOutput); //apply the FFT to the filled Complex array and overwrite its data