User`s guide

Chapter 21: Automation 311
2 Select the area of the track you want to
edit. All automated controls update to re-
flect the automation 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 > Trim Automation and do
one of the following:
◆ To write the current delta value to only
the currently displayed automation param-
eter, choose To Current Parameter.
◆ To write the current delta value for all au-
tomation parameters enabled in the Auto-
mation Enable window, choose To All
Enabled Parameters.
Setting the Automation
Buffer Size
Pro Tools allows you to specify the size of
the memory buffer used to write automa-
tion. If you are working on a large session
or writing a very large number of automa-
tion moves, you may want to increase this
value.
To set the Automation Buffer size:
1 Choose Setups > Preferences and click
Automation.
2 For the option “Amount of memory to
reserve for automation recording,” enter a
value between 200 and 3000K for this op-
tion (the default value for a new session is
200K.)
3 Relaunch Pro Tools for this change to
take effect.
About Processing Bandwidth
Meters in the Automation Enable window
indicate how much of your system’s pro-
cessing power is being used in processing
audio, and when writing and playing back
automation. On Pro Tools LE-based sys-
tems, these meters show System Load and
CPU processing capacity; on Pro Tools
TDM systems, they show System Load and
PCI bus traffic.
As these meters approach their limits, re-
cording or playback of automation data
may be affected. If CPU Load or PCI Load
are high, a System error may occur. If Sys-
tem Load is high, Pro Tools may miss play-
back of some of your automation data dur-
ing particularly dense periods of activity.
In both cases, to reduce processing load,
you can first try deselecting the Moving
Faders During Playback option in the Auto-
mation Preferences.
You can also reduce the density of automa-
tion in places where it shows the most ac-
tivity. For details, see “Thinning Automa-
tion” on page 299.
Load Meters in the Automation Enable Window