Background noise reduction

I would like to find a way to reduce the amount of background noise/hissing from my file.
I have been importing audio (music) from a cassette tape directly into Soundtrack. After making the necessary edits to the track I have been using the "Bitcrusher" effect to improve the "punchiness" of the sound. Then I have been exporting to iTunes as an .aiff file, followed by an import for iTunes and the file is transferred into my music file. Then I burned to a CD.
The sound is just okay and there is definitely a loud hissing noise as the volume is turned up. Does anyone have suggestions on how to:
a. Improve the overall quality of the sound?
b. Reduce the mount of background hissing/noise
The noise is not very apparent during playback on my computer just when I play it back on CD.
Thanks!

Bob,
Soundtrack Pro (STP) is currently at 1.0.3.
Where you have a section of your audio with no voice but background noise, did you use that as your noiseprint (STP, menu bar: process then set noiseprint) or as the section for Bias Soap to learn? After that, use the tool settings to listen to what either program is actually taking out (STP, menu bar: process then reduce noise, or Soap, and click noise only in either one). I typically reduce the amount of noise reduction to ensure I'm not affecting the voice (you don't want to hear the voice in noise only mode). Then I listen to it normally to ensure I haven't over done it on the noise reduction.

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