Avid Technology Eleven Rack, User Manual

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Chapter 7: Pro Tools Configuration 55
RTAS Error Suppression Options
Ignore Errors During Playback/Record
When en-
abled, Pro Tools continues to play and record
even if the RTAS processing requirements ex-
ceed the selected
CPU Usage Limit
. This can result
in pops and clicks in the audio, but does not
stop the transport.
Minimize Additional I/O Latency (Mac
Only)
When enabled, any additional latency due
to suppressing RTAS errors during playback and
record is minimized to 128 samples. Suppressing
RTAS errors requires at least 128 samples of ad-
ditional buffering on some systems. If this op-
tion is disabled, the buffer is half the
H/W Buffer
Size , or at least 128 samples (whichever is
greater). If you are on an older, slower computer,
you may want to disable this option to avoid ad-
verse performance.
This option is only available on Mac if the
Ignore
Errors During Playback/Record
option is enabled.
DAE Playback Buffer Size
The
DAE Playback Buffer Size
setting determines
the amount of memory DAE allocates for disk
buffers. In addition to levels, the
DAE Playback
Buffer Size
shows values in milliseconds, which
indicate 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 (Default) .
• DAE Playback Buffer Size settings lower than
1500 msec; Level 2 (Default) may improve
playback and recording initiation speed, as
well as preview in context in DigiBase brows-
ers. However, a lower setting may make it dif-
ficult 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-fragmented hard
drives.
• DAE Playback Buffer Size settings higher than
1500 msec; Level 2 (Default) 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 playback or recording, starting pre-
view in context from DigiBase browsers, 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, se-
lect 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.
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.