Specifications

Chapter 20: Record Setup 455
In addition, reducing the buffer size limits the
number of simultaneous audio tracks you can re-
cord without encountering performance errors.
While there may be times when you want a larger
buffer size, such as when you have higher track
counts with more plug-ins, you will generally want
the smallest possible buffer size when latency is
present during recording and monitoring.
If you are monitoring the recording source with an
external mixer before it is routed to Pro Tools, you
will not hear any latency.
To set the Hardware Buffer Size:
1 Choose Setup > Playback Engine.
2 Choose the number of samples from the H/W
Buffer Size
pop-up menu.
3 Click OK.
Recording with Delay
Compensation
Generally, you will want to record with Delay
Compensation enabled to maintain phase coherent
time alignment between tracks with different DSP
delays. However, you will generally want to avoid
using inserts on recording tracks or tracks used for
controlling the levels of cue mixes. For more infor-
mation, see “Delay Compensation” on page 971.
Zero Latency Monitoring
(Mbox, Mbox 2, Mbox Mini, and Mbox 2 Mini
Only)
Mbox (3rd generation), Mbox 2, Mbox Mini, and
Mbox Mini 2 give you the ability to monitor your
analog input signals while recording, without hear-
ing any latency. This zero-latency analog monitor-
ing is controlled by the front panel Mix knob,
which you can use to blend and adjust the mix be-
tween the interface’s analog input and Pro Tools
playback. For more information, see your system’s
User Guide.
Low Latency Monitoring
(HD Native, 003, 003 Rack, 003 Rack+, Digi 002,
Digi 002 Rack, Mbox Pro, Mbox Pro 2, and Core
Audio and ASIO Interfaces with Built-in Mixers
Only)
HD Native, 003, 003 Rack, 003 Rack+, Digi 002,
Digi 002 Rack, Mbox Pro, and Mbox Pro 2 sys-
tems can use the
Low Latency Monitoring option to
record with an extremely small amount of monitor-
ing latency, to as many tracks as each system sup-
ports.
Likewise, certain Core Audio and ASIO audio in-
terfaces that have a built-in mixer (such as the
RME Fireface or the MOTU 828) can use the
Low
Latency Monitoring
option.
Only tracks with inputs set to a physical output
(not an internal mix bus) use Low Latency Moni-
toring.
For more information on the H/W Buffer Size
setting, see “Hardware Buffer Size” on
page 66.
Computers with slower CPUs may not be
able to use a H/W Buffer Size setting lower
than 512 samples buffer size without encoun-
tering performance errors.
If your Core Audio or ASIO hardware does
not have a built-in mixer, Low Latency Mon-
itoring does not function. If you do
enable Low Latency Monitoring with such
hardware, monitoring will not available for
record-enabled tracks in Pro Tools.