Acoustica Mixcraft 7 - Manual (Page 81)

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The above image shows an example of a good noise sample. The noise is
determined by the audio section between the Noise Start and Noise End controls.
You can edit the noise sample by clicking and dragging the Noise Start or Noise End
controls. To automatically locate the next best noise print, click the Find Next Noise
Sample button next to the Noise Reduction slider. (It’s the button with the green
downward arrow on a wee waveform.) This instructs Mixcraft to look for the next
best noise sample based on what it thinks could be noise. Only you know what
noise is, though, so you may need to adjust it manually.
 Finding A Noise Sample
The best candidate for noise reduction is a sound that has a snippet of the noise
by itself. For example, if you had an air conditioner in the background and started
recording, there would likely be one second of the air conditioner by itself – this
would make an ideal noise sample. If you don’t have a good sample of the noise,
you could potentially record the noise by itself and then merge the clips together.
If you find a section with a good sample of the noise you’d like to get rid of,
highlight it in the audio tab, then right-click and select Set Noise Reduction
From Selection.
 Normalize
Checking the Normalize check box automatically increases the peak level of an
audio waveform to full 100% scale while proportionally increasing the level of
the entire waveform. In this way, audio files will play back as loudly as possible
before clipping. Unlike a compressor or limiter, the dynamic range of a sound
is not altered; normalization simply makes the entire waveform proportionately
louder. Like most Mixcraft audio processes, normalization is non-destructive,
so unchecking the Normalize checkbox will return the waveform to its original
gain state.