User Manual

Pro Tools Reference Guide66
Sample Rate (Playback Engine)
(Pro Tools HD Only)
The Sample Rate setting in the Playback Engine
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 With no session open, 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 setting in the
Playback Engine determines how much DSP re-
sources are dedicated to Pro Tools Delay Com-
pensation, which manages DSP and host-based
delays in the Pro Tools mixer.
Within a session, you can choose to enable or
disable Delay Compensation (Options > Delay
Compensation).
To configure the Delay Compensation Engine:
1 Choose Setup > Playback Engine.
2 From the Delay Compensation Engine pop-up
menu, select Short, Long, or None.
3 Click OK.
Delay Compensation Settings
There are three settings in the Playback Engine
to dedicate processing resources for Delay Com-
pensation:
None Allocates no resources for Delay Compen-
sation.
Short Allocates minimum resources for Delay
Compensation for each channel. This is the
most efficient setting. For sessions with only a
few plug-ins that do not induce too much DSP
and host–based delay, this setting should be suf-
ficient.
Long Allocates maximum resources for Delay
Compensation for each mixer channel. For ses-
sions with a lot of plug-ins resulting in a large
amount of DSP and host–based delay, select this
setting.
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. (
See “Creating a New Session” on
page 158.)
You can also change the default
Sample Rate in the Hardware Setup, as long
as no session is open.
To make a copy of a session with a new
sample rate, use Save Copy In.
For more information, see “Delay Compen-
sation” on page 956.