DigiDesign Pro Tools, Справочное руководство

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Chapter 21: Fades and Crossfades 475
Crossfades On Tick-Based Audio Tracks
Crossfades are re-rendered after changing tempo
in a tick-based audio track. The new crossfade is
the same duration as the crossfade prior to the
tempo change.
If there is not enough audio material to com-
plete the crossfade, or if the new crossfade area
falls outside of valid region boundaries, the
crossfade is removed.
Pre and Post Crossfade Selections
By making a selection that begins or ends pre-
cisely on the border of two regions, you can cre-
ate “pre” or “post” crossfades. Use the Tab key to
place the insertion point at the exact beginning
or end of a region.
To create a pre- or post-crossfade:
1
With the Selector tool, click in the track that
contains the regions you want to crossfade.
2
Do one of the following:
• Press Tab to move forward to the next re-
gion boundary.
– or –
• Press Tab (Windows) or Op-
tion+Tab (Mac) to move back to the previ-
ous region boundary.
3
Extend the selection as follows:
• Shift-drag to adjust your selection, or press
Shift+Tab to extend the selection forward
to the next region boundary.
– or –
• Press Shift+Tab (Windows) or Op-
tion+Shift+Tab (Mac) to extend the selec-
tion back to the previous region boundary.
4
Do one of the following:
• Choose Edit > Fades > Create.
– or –
• Press F (Windows) or Com-
mand+F (Mac).
5
Select a fade type and click OK.
Using AutoFades
(Pro Tools HD Only)
Pro Tools HD can automatically apply real-time
fade-ins and fade-outs to all region boundaries
in the session. Specify the duration (0 to 10 ms)
for automatic real-time fades with the Auto Re-
gion Fade In/Out Length preference in the Op-
eration Preferences page). These fade-ins and
fade-outs are performed during playback and do
not appear in the Edit window, and are not writ-
ten to disk.
The automatic fade-in/out option also has an ef-
fect on Voice borrowing in a session. Whenever
a lower-priority virtual track “pops thru” a si-
lence in a higher-priority track on the same
voice, a fade-in and fade-out is applied to the
transition.
This feature is especially useful in post produc-
tion situations such as dialogue tracking. For ex-
ample, you could assign both a dialogue track
and a “room tone” track with matching back-
ground to the same voice. You could then set
the AutoFade option to a moderate length (4 ms
or so) so that whenever a silence occurred in the
dialog, playback would switch smoothly to and
from the background track without clicks or
pops.