DigiDesign Pro Tools, Справочное руководство

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Chapter 30: Automation 735
Snapshot Automation and
Trimming of Automation Data
Pro Tools lets you use trim values as snapshots
and apply the
relative changes (delta values) to
the selected automation by using the Trim Au-
tomation command. This works in much the
same way as the Write Automation command,
except that it writes delta values instead of abso-
lute values to automation data.
You can use trim values in writing snapshot au-
tomation to any automatable parameter.
To create a snapshot of relative changes in
automation data:
1
In the Automation window, make sure that
the automation parameters you want to edit are
write-enabled. Deselect any parameters whose
automation you want to preserve.
2
Select the area of the track you want to edit.
All automated controls update to reflect the au-
tomation at the beginning of the selection.
3
Move the controls for the parameter up or
down by the amount you want to change the
data.
4
Choose Edit > Automation and do one of the
following:
• To write the current delta value to only the
currently displayed automation parameter,
choose Trim to Current.
– or –
• To write the current delta value for all auto-
mation parameters enabled in the Automa-
tion window, choose Trim to All Enabled.
Previewing Automation
(Pro Tools HD Only)
Automation Preview mode lets you audition
changes to a mix and compare them to existing
automation values without committing them to
the automation playlist.
When you put Pro Tools in Automation Preview
mode, you can preview values for automation-
enabled controls on any track that is in a writ-
able automation mode.
While in Automation Preview mode, when you
touch or move a control, it
isolates the control,
disengaging it from its automation playlist. The
control stops reading or writing automation, al-
lowing you to freely audition changes.
When you have found a level or state that you
want to use, you can then commit or
punch the
previewed value to the automation playlist for
the isolated controls.
◆
If you punch during playback, the automa-
tion mode is set to Latch and writing begins at
the preview value.
◆
If you punch while the transport is stopped,
the automation mode is set to Latch and the
control is primed at the preview value.
It is not necessary for the Allow Latch Prime
in Stop preference to be enabled for Preview
to put a control into Latch Prime.