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Chapter 5: Advanced Automation Features 57

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 Auto-

mation command. This works in much the same

way as the Write Automation command, except

that it writes delta values instead of absolute val-

ues 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.

Preview Automation

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.

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