DigiDesign DigiRack, Manual

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Chapter 7: DigiRack AudioSuite Plug-ins 105
Use the Ratio, Crossfade, Min Pitch, and Accu-
racy controls to fine-tune the Time Compres-
sion/Expansion process.
Ratio Sets the destination length in relation to
the source length. Moving the slider to the right
increases the length of the destination file,
while moving the slider to the left decreases its
length.
Crossfade Adjusts the crossfade length in milli-
seconds, optimizing performance of the Time
Compression/Expansion according to the type
of audio material being processed. (This plug-in
achieves length modification by replicating or
subtracting very small portions of audio mate-
rial and very quickly crossfading between these
alterations in the waveform of the audio mate-
rial.)
Crossfade length affects the amount of smooth-
ing performed on audio material. This prevents
audio artifacts such as clicks from occurring.
Long crossfade times may over-smooth a signal
and its transients. This may not be desirable on
drums and other material with sharp transients.
Use the Crossfade slider to manually adjust and
optimize crossfade times if necessary. For audio
material with sharper attack transients, use
smaller crossfade times. For audio material with
softer attack transients, use longer crossfade
times.
Min Pitch Sets the minimum, or lowest, pitch
that will be used in the plug-in’s calculations
during the Time Compression/Expansion pro-
cess. The control has a range of 40 Hz to 1000
Hz.
This control should be set lower when process-
ing bass guitar or audio material with a low fre-
quency range. Set this control higher when pro-
cessing higher frequency range audio material.
Accuracy Prioritizes the processing resources al-
located to audio quality (Sound) or timing
(Rhythm). Moving the slider towards “Sound”
generally results in better sonic quality and
fewer audio artifacts. Moving the slider towards
“Rhythm” puts the emphasis on keeping the
tempo consistent.
When you are working with audio loops, listen
carefully and adjust the Accuracy slider until
you find a setting that keeps timing solid within
the region. If you don’t, start and end times may
be precise, but the beats in rhythmic material
may appear to be shuffled if too little priority is
given to Rhythm.
Time Compression & Expansion settings
created in version 4.x and later of Pro Tools
for Windows are not compatible with later
versions.