Audio Frequency Spectrum

Hi,
I'm looking for an FCE feature (3.5), or a Soundtrack feature (1.5) that allows to display the audio +frequency spectrum+ of a selection of an audio clip. My purpose is to analyze frequencies for a section of audio (e.g. a voice or a noise), identify a frequency range to fix, and modify its gain by using the standard FCE +3 Band Equalizer+ filter or the +AUGraphic EQ+ filter (or others).
I can already use these 2 filters, but without a preliminary analysis of the spectrum I have to guess the frequency ranges. Of course the best solution would be to have a dynamic real time display, during audio playback... (BTW iTunes has something like that in the top center of the main window: it's just missing precision and details about frequency values, and dBs... - not really useful).
I found something close to my needs in Audacity: the problem is that it is not integrated with FCE and that it is a static display. Or at least this is what it seems to me... I might have missed something.
Does an audio frequency spectrum display exist in FCE HD, or in the bundled Soundtrack ?
Thanks a lot
Piero
(since I didn't find any mention of this kind of display in this forum or in the Soundtrack forum - frequency or spectrum search do not return any topic - does this mean I'm looking for something that does not make sense... ? or are there other ways to do what I'd like and I described above ?)

Thanks Ian and Tom.
Yes, the Fourier Spectrum Analysis is what I need, and Sound Studio is providing it. I'm trying to figure out how to make the best use of it. In fact I hope there is a way to display it in real time, so I can see the frequency picks moving. That would be very helpful.
In any case thanks for your help.
Piero

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