There is no FFT-based filter function in FlexPro but the FPScript function Resample() uses the same principle.
You should note however that this procedure does not lead to an ideal filter as well due to the leakage effect of the FFT. Just try signals with different phase angles at the beginning and at the end.
Please try out the new Digital Filters option. The FIR filters, which you can design with this option, always have linear phase. The phase delay can be optionally corrected.
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