Hello. I've downloaded a DLL for Fourier Transformations.

Declare Sub FFTSingle Lib "FFT.dll" Alias "fft_float" _
(ByVal NumSamples As Long, ByVal InverseTransform As Boolean, _
RealIn As Single, _
ImagIn As Single, _
RealOut As Single, _
ImagOut As Single)



RealIn and ImagIn are the first elements of an array containing the information of the wave.

But what are those inputs Real and Imag for. I thought I do only ne one input array.. that contains the wave. why two arrays??

Thanks for any help.