Specifications

Chapter 4: Configuring Your Pro Tools System 41
Default Sample Rate
The Sample Rate setting determines the default
sample rate when you create a new session. This
setting is available only when there is no session
open. Otherwise, the current session sample rate
is displayed, but cannot be changed.
To change the default Sample Rate in the
Playback Engine:
1 Choose Setup > Playback Engine.
2 Select the sample rate from the Sample Rate
pop-up menu.
3 Click OK.
Delay Compensation Engine
The Delay Compensation Engine determines
how much DSP resources are dedicated for Delay
Compensation, which managing DSP delays in
the Pro Tools mixer.
Within a session, you can choose to enable or
disable Delay Compensation (Options > Delay
Compensation).
Delay Compensation automatically manages
DSP delays that occur on audio tracks, Auxiliary
Inputs, or Master Faders because of plug-in use
and mixer routing. With Delay Compensation
enabled, Pro Tools maintains phase coherent
time alignment between track outputs that have
plug-ins with differing DSP delays, tracks with
different mixing paths, tracks that are split off
and recombined within the mixer, and tracks
with hardware inserts.
To maintain phase coherent time alignment,
Pro Tools adds the exact amount of delay to
each track necessary to make that particular
track’s delay equal to the total system delay. The
System Delay is shown in the Session Setup win-
dow.
Delay Compensation should be enabled during
mixing and playback for phase coherent time
alignment between track outputs. When record-
ing, Delay Compensation should be turned off
ion most cases.
To configure the Delay Compensation Engine:
1 Choose Setup > Playback Engine.
2 From the Delay Compensation Engine pop-up
menu, select a Delay compensation setting.
3 Click OK.
Delay Compensation Settings
There are three settings in the Playback Engine
dialog for dedicating DSP resources for Delay
Compensation:
None Allocates no DSP resources for Delay Com-
pensation.
Short Allocates minimum DSP resources of De-
lay Compensation for each channel. This is the
most efficient setting for Pro Tools|HD Accel
systems. For sessions with only a few plug-ins
that do not induce too much DSP-based delay,
this setting should be sufficient.
The Sample Rate setting can affect the
number of available voices.
You can change the sample rate when
creating a new Pro Tools session by
selecting a different sample rate in the
New Session dialog.
You can also change the default Sample
Rate in the Hardware dialog, as long as
no session is open.
For more information on using Delay Com-
pensation, see the Pro Tools Reference
Guide.