Apple Using WaveBurner Pro 1.0 (with Logic Pro) - Manual (Page 33)

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By adjusting the Time smoothing slider, you can set the amount of time the Denoiser
takes to reach maximum noise reduction. By adjusting the Level smoothing slider, you
can set a factor for a smoother transition between adjacent volume levels. When the
Denoiser recognizes that only noise is present in a certain volume range, the higher the
Transition smoothing parameter is set, the more it will also change similar level values
to avoid glass noise.
Stereo Spread
The Stereo Spread plug-in provides another commonly used mastering effect. It
enhances the perception of stereo by extending the stereo base. Some stereo
enhancing algorithms function by changing the phase of the signal, which can distort
your mix and produce unpredictable results. Instead, the Stereo Spread plug-in extends
the stereo base by distributing a selectable number of bands in the middle frequency
range alternately left and right. This increases the perception of stereo without causing
unnatural-sounding distortion of the mix.
The main parameters of the Stereo Spread plug-in are Order, Upper Intensity (Upper Int.),
and Lower Intensity (Lower Int.). The Order parameter determines number of frequency
bands into which the signal is divided. The Upper Intensity parameter controls the
intensity of the base extension of the upper frequency bands. The Lower Intensity
parameter controls the intensity of the base extension of the lower frequency bands.
Human beings perceive stereo placement of sounds mainly in the middle and high
frequencies. If very low frequencies are distributed between the left and right speakers,
the energy distribution for both speakers will be significantly worse. Therefore, it is
always best to select a lower intensity setting for the lower frequency bands, and avoid
setting the Lower Freq. below 300 Hz.