Apple Soundtrack Pro 3 - Manual (Page 261)

3 In the Reduce Noise dialog that appears, you can optionally set the following:
• The noise threshold: The noise threshold determines the level below which audio in the
noise print is considered to be noise. Lowering the threshold results in only very low
signals being reduced, while raising the threshold results in more high-level signals
being reduced.
• The tone for noise reduction: The Tone Control slider controls whether low-frequency
content (bass) or high-frequency content (treble) is preserved during noise reduction.
You can also preview the noise reduction with the dialog open.
To set the threshold of the noise reduction
µ
In the Reduce Noise dialog, drag the Noise Threshold slider left to lower the threshold,
or drag it right to raise the threshold. You can also type a value (in decibels) in the Noise
Threshold field.
To set the amount of noise reduction
µ
Drag the Reduction slider left to decrease the amount of noise reduction, or drag it right
to increase the amount of noise reduction.
To change the tone of the noise reduction
µ
In the Reduce Noise dialog, drag the Tone Control slider left to preserve more
low-frequency content (bass), or drag it right to preserve high-frequency content (treble)
during noise reduction.
You can preview noise reduction with the Reduce Noise dialog open and adjust the
threshold and tone of noise reduction. You can also hear the audio file or selection with
and without noise reduction, or hear only the noise to be removed.
To preview the file with noise reduction
µ
Click the Play button in the lower part of the Reduce Noise dialog.
To set the preview volume level
µ
Drag the Volume slider in the lower part of the Reduce Noise dialog left to lower the
volume or right to raise the volume.
To compare the file with and without noise reduction
µ
Click the Bypass button to hear the file without noise reduction. Click the button again
to hear the file with noise reduction.
To hear only the noise to be removed
µ
Select the Noise Only checkbox.
To use a noise reduction preset
1 In the Reduce Noise dialog, click Show Presets.
The Presets drawer appears.
261 Chapter 9 Processing Audio Files