User Manual

11.3 Specific tool windows 303
This is used to attenuate the level of a region. The Gain parameter specifies the level of the
attenuation (it is also possible to set positive gain values, i.e. to boost the frequencies in the
region). Three filter types are available to perform the damping:
Bandpass filter: All frequencies in the region are equally attenuated.
Low-pass filter: Higher frequencies in the region will be more attenuated.
High-pass filter: Lower frequencies in the region will be more attenuated.
For the Low- and High-pass filters, a low Filter steepness setting is normally used (around 6
to 18dB).
Blur peaks
This filter operation analyzes the region to find the frequencies with the highest level. The
level of these frequencies will be attenuated (or boosted) according to the set Gain value. If
the gain is negative, these frequencies will be "blurred" and disappear in the mix as a whole.
The purpose of the filter is to mask the loudest frequencies (e.g. it could be used to eliminate
a sudden burst of pitched but unwanted sound in the audio material, like acoustic feedback).
This mode works best with the Infinite steepness setting, which is automatically selected
when Blur peaks is used. You can, however, freely set any Filter steepness setting. The filter
type options are not available when this mode is selected.
Dispersion
This is a special filter that "smears" the dynamics and pitch of the region, without changing
the actual frequency content. This works best on lower frequencies, to mask the identity of
a signal without changing the frequency spectrum.
This mode works best with the Infinite steepness setting, which is automatically selected
when Dispersion is used. You can, however, freely set any Filter steepness setting. The filter
type options are not available when this mode is selected. Dispersion can also be used to
create special effects as it warps the sound in an unique way.
Fade Out
This can be used with any of the three filter types (Bandpass/Low-pass/High-pass). It grad-
ually filters the frequencies in the region along the time axis (from nothing at the left edge of
the region, to maximum allowed by the gain parameter at the right edge), useful for gradually
removing frequencies from a region.
Fade In
This works like Fade out but inversed. It can also be used in conjunction with any of the three
filter types (Bandpass/Low-pass/High-pass).
Fade out then in
This is a mix of the two previous options; the filtering effect gradually fades out until the
middle of the region, then fades back in. It can also be used in conjunction with any of the
three filter types (Bandpass/Low-pass/High-pass).
Fade in then out
The inverse of the above. It can also be used in conjunction with any of the three filter types
(Bandpass/Low-pass/High-pass).
Related topics
WaveLab 7