Thanks .. it has to be something like that and the FFT routine I am using does return an answer that is normalised to N. I.e. a sine wave with amplitude 10 will return an FFT with one bucket of height 10 (and not height N). But I can't see why white noise would suffer from the problem whereas a straight sine wave doesn't. I had quietly wondered if the FFT of noise -> 0 as N -> infinity but I suspect this is wrong.
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