Using Mac, how do I remove the hiss (noise floor)?

Hi! Well, at the most simple, Audition has a noise reduction effect...try Effects/Noise Reduction/Restoration/Noise Reduction (Process). Highlight a short section of your clip featuring just noise, not any sounds you want to keep. Turn the amount of NR down on the sliders to, say, 20% and the Reduction to, say, 10dB, hit "Select Entire File" and Okay it. If the noise is bad, you're best off to do several passes at low processing settings. Turn up the FFT size (on the Advanced menu) and grab a new noise sample between each process. FYI, the reason for doing it 3 or 4 times with small increments is that it results in a lot fewer unpleasant artefacts.
However, as others have said, use of Noise Reduction should be a last ditch option, not a normal part of the process. I have 3 different M Audio interfaces now and none give me enough noise to worry about. As a first guess from your description I wonder if it's your microphone that's noisy and, if so, no amount of playing is likely to fix it...the noise goes up and down along with the programme material as you adjust the levels.
So...a bit more info and maybe we can make some suggestions for you.

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Go to my iDisk (address below)
and download :
For_iWork:iWork '09:uninstall iWork '09.zip
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Yvan KOENIG (VALLAURIS, France) vendredi 2 janvier 2011 16:21:41
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