DigiDesign DigiRack, Manual

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Chapter 7: DigiRack AudioSuite Plug-ins 111
When Rhythmic is selected as the Audio Type,
the Transient section provides controls for set-
ting the transient detection threshold, and for
adjusting the decay rate of the transients in the
processed audio when time stretching.
Follow Enables an envelope follower that simu-
lates the original acoustics of the audio being
stretched. Click the Follow button to enable or
disable envelope following. Follow is only avail-
able when Polyphonic is selected as the Audio
Type.
Threshold Sets the transient detection threshold
from 0.0 dB to –40.0 dB. Disable transient detec-
tion by setting the Threshold control to Off
(turn the knob all the way to the right). Part of
Time Shift’s processing relies upon separating
“transient” parts of the selection from “non-
transient” parts. Transient material tends to
change its content quickly in time, as opposed
to parts of the sound which are more sustained.
Adjust the Threshold control or click the
Threshold field and type the desired value.
The default value for Threshold is –6.0 dB. For
highly percussive material, lower the threshold
for better transient detection, especially with
the Rhythmic audio setting. For less percussive
material, and for shifting with the Polyphonic
audio setting, a higher setting can yield better
results. Experiment with this control, especially
when shifting drums and percussive tracks, to
achieve the best results.
Window Sets the analysis window length for pro-
cessing audio. You can set the Window from 6.0
milliseconds to 185.0 milliseconds. Adjust the
Window control or click the Window field and
type the desired value. The Window control is
only available when Polyphonic is selected as
the Audio Type.
The default for Window size is 18.0 milliseconds
and works well for many applications, but you
may want to try different Window settings to
get the best results. Try larger window sizes for
low frequency sounds or sounds that do not
have many transients. Try smaller window sizes
for drums and percussion. 37.0 milliseconds
tends to work well for polyphonic instruments
such as piano or guitar. A setting as large as 71.0
milliseconds works well for bass guitar. Settings
in the 12 millisecond range work well on drums
or percussion.
Decay Rate Determines how much of the decay
from a transient is heard in the processed audio
when time stretching. When time stretching us-
ing the Rhythmic setting, the resulting gaps be-
tween the transients are filled in with audio, and
Decay Rate determines how much of this audio
is heard by applying a fade out rate. Decay Rate
is only available when Rhythmic is selected as
the Audio Type. Adjust the Decay Rate up to
100% to hear the audio that is filling the gaps
created by the time stretching with only a slight
fade, or adjust down to 1.0% to completely fade
out between the original transients.
Time Shift plug-in, Transient section with Rhythmic
selected as the Audio Type