Specifications

Chapter 6: System Setup 69
Error Suppression Options
Ignore Errors During Playback/Record When en-
abled, Pro Tools continues to play and record even
if the host processing requirements exceed the se-
lected
CPU Usage Limit. This can result in pops
and clicks in the audio, but does not stop the trans-
port.
Minimize Additional I/O Latency (Host-based
Pro Tools Systems Only)
When enabled, any ad-
ditional latency due to suppressing errors during
playback and record is minimized to 128 samples.
Suppressing errors requires at least 128 samples of
additional 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 using a slower computer, you
may want to disable this option to avoid adverse
performance.
This option is only available if the
Ignore Errors
During Playback/Record
option is enabled and the
Pro Tools system you are using requires additional
buffering for error suppression, as follows:
• Windows:
• Mbox Pro and Mbox 2 Pro
• Mac:
• 003 family devices
• Eleven Rack
• Mbox family devices
• Digi 002 and 002 Rack
• Pro Tools Aggregate I/O
Number of Voices
(Avid HDX and Pro Tools|HD Systems Only)
On Avid HDX and Pro Tools|HD systems, the
Number of Voices setting in the Playback Engine
lets you control the number of available voices and
how those voices are allocated to DSPs in your
system. For example, the default number of voices
on a Pro Tools|HD 1 system is 48 voices, using
one DSP (at sample rates of 44.1 kHz or 48 kHz).
Changing the number of voices affects DSP usage,
the total number of voiceable tracks, and overall
system performance.
Depending on the session sample rate and the
number of Avid HDX or Pro Tools|HD cards in
your system, there are different choices for voice
count. For voice limits on different Avid HDX and
Pro Tools|HD systems, see “Playback, Recording,
and Voice Limits with Pro Tools HD” on page 49.
If the Ignore Errors During Playback/Record
option is enabled, you can experience badly
distorted audio as a result of too many CPU
intensive Native (AAX or RTAS) plug-ins ac-
tive in the session (such as Eleven Free or var-
ious virtual instrument plug-ins). This is be-
cause Pro Tools is suppressing playback
errors that would normally be seen if Error
Suppression were disabled. If you encounter
this problem, remove or make inactive any un-
necessary Native plug-ins. You can also iso-
late and bus record any tracks that use virtual
instruments, and then make those source
tracks inactive to free up processing re-
sources.