Specifications
Pro Tools|HD Getting Started Guide42
Long Allocates maximum DSP resources for De-
lay Compensation for each mixer channel. For
sessions with a lot of plug-ins resulting in a large
amount of DSP-induced delay, select this set-
ting.
DAE Playback Buffer Size
The DAE Playback Buffer Size determines the
amount of memory DAE allocates for disk buff-
ers. In addition to levels, the DAE Playback
Buffer Size shows values in milliseconds, which
indicates the amount of audio buffered when
the system reads from disk.
The optimum DAE Playback Buffer Size for most
disk operations is 1500 msec (Level 2).
• DAE Playback Buffer Size settings lower than
1500 msec (Level 2) may improve playback and
recording initiation speed. However, a lower set-
ting may make it difficult to play or record
tracks reliably with sessions containing a large
number of tracks or a high density of edits, or
with systems that have slower or heavily frag-
mented hard drives.
• DAE Playback Buffer Size settings higher than
1500 msec (Level 2) allow higher track count,
higher density of edits in a session, or the use of
slower hard drives. However, a higher setting
may increase the time lag when starting play-
back or recording, or cause a longer audible time
lag while editing during playback.
To change the DAE Playback Buffer Size:
1 Choose Setup > Playback Engine.
2 From the DAE Playback Buffer pop-up menu,
select a buffer size. Memory requirements for
each setting are shown at the bottom of the
Playback Engine dialog.
3 Click OK.
If Pro Tools needs more system memory for the
DAE Playback Buffer, it will prompt you to re-
start your computer.
Cache Size
The Cache Size determines the amount of mem-
ory DAE allocates to pre-buffer audio for play-
back and looping when using Elastic Audio.
The optimum Cache Size for most sessions is
Normal.
• A Cache Size setting of Minimum reduces the
amount of system memory used for disk opera-
tions and frees up memory for other system
tasks. However, performance when using Elastic
Audio features may decrease.
Using a larger DAE Playback Buffer Size
leaves less system memory for other tasks.
The default setting of 1500 msec (Level 2) is
recommended unless you are encountering
-9073 (“Disk too slow or fragmented”)
errors.
Playback Buffer Size menu in the Playback Engine
dialog