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I am using procedure FFTC1D in Delphi 7.0.
The problem I have is the following:
this procedure changes variables not being the outputvariable of the procedure.

So executing FFT.FFTC1D(W,N); changes variable Inp!

Extra:
I am not using explicit pointers nor directive Absolute.

Note:
I have seen the procedure FFTC1D is using a lot of Move-functions and I think one of them is done incorrect?!

Please Help.

FFTC1D performs inplace conversion of input array. Look, it has no other way of telling about its results except for replacing W.

As for Inp variable - you did not performed true copying of Inp to W, you just copied references. So, W and Inp point to same array.

Thank you Sergey, I dit not realize that TComplex1DArray is a pointer.
After reprogramming the module with FFTC1D it is working fine now.

Problem solved.