Avid, Digidesign, Mbox , Control|24, Pro Tools LE, and
Pro Tools are either trademarks or registered trademarks of
Avid Technology, Inc. in the US and other countries. All other
trademarks contained herein are the property of their
respective owners.
Product features, specifications, system requirements, and
availability are subject to change without notice.
PN 9329-56012-00 REV A 10/06
Communications and Safety Regulation Information
Compliance Statement
This model Digidesign Mbox 2 Pro complies with the following
standards regulating interference and EMC:
• FCC Part 15 Class B
• EN 55022 Class B
• EN 55204 Class B
• AS/NZS 3548 Class B
• CISPR 22 Class B
Radio and Television Interference
This equipment has been tested and found to comply with the
limits for a Class B digital device, pursuant to Part 15 of the
FCC Rules.
DECLARATION OF CONFORMITY
We Digidesign,
2001 Junipero Serra Boulevard, Suite 200
Daly City, CA 94014 USA
tel: 650-731-6300
declare under our sole responsibility that the product
Mbox 2 Pro
complies with Part 15 of FCC Rules.
Operation is subject to the following two conditions: (1) this
device may not cause harmful interference, and (2) this device
must accept any interference received, including interference
that may cause undesired operation.
NOTE: This equipment has been tested and found to comply
with the limits for a Class B digital device, pursuant to Part 15
of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a
residential installation. This equipment generates, uses, and
can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no
guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference
to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try
and correct the interference by one or more of the following
measures:
• Reorient or locate the receiving antenna.
• Increase the separation between the equipment and
receiver.
• Connect the equipment into an outlet on a circuit different
from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician
for help.
Mbox 2 Pro
Any modifications to the unit, unless expressly approved by
Digidesign, could void the user's authority to operate the
equipment.
Canadian Compliance Statement:
This Class B digital apparatus complies with Canadian ICES-
003.
Cet appareil numérique de la classe B est conforme à la norme
NMB-003 du Canada.
Australian Compliance
European Compliance
Safety Statement
This equipment has been tested to comply with USA and
Canadian safety certification in accordance with the
specifications of UL Standards: UL60065 7th /IEC 60065 7th
and Canadian CAN/CSA C22.2 60065:03. Digidesign Inc., has
been authorized to apply the appropriate UL & CUL mark on its
compliant equipment.
Warning
Important Safety Instructions
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
5) Do not use this apparatus near water.
6) Clean only with dry cloth.
7) Do not block any ventilation openings. Install in accordance
with the manufacturer’s instructions.
8) Do not install near any heat sources such as radiators, heat
registers, stoves, or other apparatus (including amplifiers) that
produce heat.
9) Do not defeat the safety purpose of the polarized or
grounding-type plug. A polarized plug has two blades with one
wider than the other. A grounding type plug has two blades and
a third grounding prong. The wide blade or the third prong are
provided for your safety. If the provided plug does not fit into
your outlet, consult an electrician for replacement of the
obsolete outlet.
10) Protect the power cord from being walked on or pinched
particularly at plugs, convenience receptacles, and the point
where they exit from the apparatus.
11) Only use attachments/accessories specified by the
manufacturer.
12) Use caution when replacing the Lithium battery in the FOH
Rack unit. There is danger of explosion if battery is incorrectly
replaced. Replace only with the same or equivalent type.
13) Unplug this apparatus during lightning storms or when
unused for long periods of time.
14) Refer all servicing to qualified service personnel. Servicing
is required when the apparatus has been damaged in any way,
such as power-supply cord or plug is damaged, liquid has been
spilled or objects have fallen into the apparatus, the apparatus
has been exposed to rain or moisture, does not operate
normally, or has been dropped.
Installing Pro Tools LE™ for Mbox® 2 Pro on a
Windows computer includes the following
steps:
1
“Windows System Optimization” on page 9
2
“Installing Pro Tools LE and Mbox 2 Pro” on
page 12.
3
“Launching Pro Tools LE” on page 14.
4
“Configuring Pro Tools LE” on page 14.
5
“Making Hardware Connections” on page 33.
Mac Installation Overview
(Mac OS X Systems Only)
Installation of Pro Tools LE for Mbox 2 Pro on a
Mac includes the following steps:
1
“Mac System Optimization” on page 19.
2
“Connecting Mbox 2 Pro to the Computer”
on page 21.
3
“Installing Pro Tools LE” on page 21.
4
“Launching Pro Tools LE” on page 22.
5
“Making Hardware Connections” on page 33.
Chapter 1: Installation QuickStart
1
Mbox 2 Pro Getting Started
2
chapter 2
Welcome to Mbox 2 Pro
Welcome to the Digidesign® Mbox® 2 Pro portable Pro Tools micro-studio.
Mbox 2 Pro Package
Mbox 2 Pro provides your Firewire-equipped
computer with four channels of analog audio
input, six channels of analog audio output, two
channels of digital audio input and output,
MIDI In and Out ports, two channels of analog
monitor output, and two headphone outputs
with front panel level control. Mbox 2 Pro provides professional-quality mic preamps and 24bit analog-to-digital and digital-to-analog converters.
The Mbox 2 Pro package includes the following:
• Mbox 2 Pro desktop audio interface and
power adapter
• Installer disc containing Pro Tools LE software, DigiRack RTAS (Real-Time AudioSuite)
and AudioSuite plug-ins, optional software,
and electronic PDF guides
• This
Mbox 2 Pro Getting Started Guide
includes instructions for installing and configuring Mbox 2 Pro, and an introduction to
Pro Tools LE software
• Firewire connector cable (six-pin 1394)
• Digidesign Online Registration Card
, which
Chapter 2: Welcome to Mbox 2 Pro
3
Mbox 2 Pro Features
The Mbox 2 Pro provides the following:
Audio Inputs and Outputs
Mbox 2 Pro lets your Pro Tools LE sessions utilize up to six discrete channels of input and up
to eight discrete channels of output, using the
following analog and digital I/O:
Analog Inputs
• Two channels of analog audio input with
microphone preamps and switchable 48V
phantom power. These analog input jacks
include one XLR/TRS combo connector on
the back panel, and two 1/4-inch DI connectors with switchable Mic and DI source
selection and LEDs on the front panel. A
–20 dB pad is also available separately on
each analog input channel
• Two additional channels of analog audio
input for Line and Phono sources (RIAA)
Analog Outputs
• Two 1/4-inch TRS analog Monitor outputs
• Four additional 1/4-inch balanced analog
line outputs
• Two additional channels of unbalanced
outputs on a single 1/4-inch TRS connector
Digital I/O
• Two channels of S/PDIF digital input and output. S/PDIF inputs are available independent
of, and in addition to, analog inputs 1–4
when clocking to S/PDIF. S/PDIF outputs are
always available in Pro Tools
Capabilities and Specifications
• 24-bit A/D and D/A converters, supporting
sample rates of 44.1 kHz, 48 kHz, 88.2 kHz
and 96 kHz
• Low latency analog record monitoring
• Two 1/4-inch
(A and B) with adjustable level controls. Headphones B can mirror A (output channels 1–2)
or be switched to output channels 3–4
(
TRS) stereo headphone outputs
Pro Tools LE Capabilities
Pro Tools LE on Windows or Mac provides the
following capabilities with Mbox 2 Pro:
• Playback of up to 32 mono (or 16 stereo)
digital audio tracks, or a combination of
playing back and recording up to 32 mono
(or 16 stereo) digital audio tracks, depending on your computer’s capabilities
• Up to 128 audio tracks (with 32 voiceable
tracks maximum), 128 Auxiliary Input
tracks, 64 Master Fader tracks, 256 MIDI
tracks, and 32 Instrument tracks per session
• 16-bit or 24-bit audio resolution, at sample
rates up to 96 kHz
• Nondestructive, random-access editing
and mix automation
• Audio processing with up to 5 RTAS plugins per track, depending on your computer’s capabilities
• Up to 5 hardware inserts per track
• Up to 10 sends per track
• Up to 32 internal mix busses
MIDI
• One MIDI In and one MIDI Out port, providing 16 MIDI input channels and 16 MIDI output channels
Mbox 2 Pro Getting Started
4
Pro Tools LE uses your computer’s CPU to
mix and process audio tracks (host processing). Computers with faster clock speeds
yield higher track counts and more plug-in
processing.
System Requirements
Mbox 2 Pro can be used with a Digidesign-qualified Windows or Mac computer. For complete
system requirements, visit the Digidesign Web
site (www.digidesign.com).
Compatibility Information
Digidesign can only assure compatibility and
provide support for hardware and software it
has tested and approved. For a list of Digidesignqualified computers, operating systems, hard
drives, and third-party devices, refer to the Digidesign Web site (www.digidesign.com).
Hard Drive Requirements
For a list of Digidesign-qualified hard drives,
refer to the Digidesign Web site
(www.digidesign.com).
If you are using an ATA/IDE or FireWire hard
drive, initialize your drive with Windows Disk
Management (Windows) or the Disk Utility application included with Apple System software
(Mac).
For more information, see Appendix C,
“Hard Drive Configuration and Maintenance.”
Avoid Recording to the System Drive
MIDI Requirements
Mbox 2 Pro includes one MIDI In port and one
MIDI Out port, providing 16 channels of MIDI
input and 16 channels of MIDI output.
If you require additional MIDI ports, add a MIDI
interface to your system. USB MIDI interfaces
work effectively with Pro Tools systems on Windows or Mac. Serial MIDI interfaces are supported on Windows systems only.
Only USB MIDI interfaces are compatible
with Pro Tools systems for Mac OS X.
Modem-to-serial port adapters and serial
MIDI devices are not supported.
For a list of supported adapters, refer to the Digidesign Web site (www.digidesign.com).
Recording to your system drive is not recommended. Recording and playback on a system
drive may result in lower track counts and fewer
plug-ins.
Digidesign does not recommend recording
to the system drive. Record to a system drive
only when necessary.
Digidesign Registration
Review the enclosed Digidesign Online Registration Card and follow the instructions on it to
quickly register your purchase online. Registering your purchase is the only way you can be eligible to receive complimentary technical support and future upgrade offers. It is one of the
most important steps you can take as a new user.
Chapter 2: Welcome to Mbox 2 Pro 5
About the Pro Tools Guides
This Getting Started guide explains how to install Pro Tools LE software, make basic connections to your Mbox 2 Pro interface (to get sound
in and out of your interface), and do common
tasks (such as recording in Pro Tools).
For additional information, see the following
online (.pdf) guides:
• Pro Tools Reference Guide explains Pro Tools
software in detail.
• DigiRack Plug-Ins Guide explains how to use
the RTAS and AudioSuite plug-ins included
with Pro Tools.
• Digidesign Plug-Ins Guide explains how to use
optional Digidesign plug-ins.
• DigiBase Guide provides details on using
Pro Tools DigiBase databasing and browsers
for data and media management.
• Pro Tools Menus Guide covers all the Pro Tools
on-screen menus.
• Pro Tools Keyboard Shortcuts lists keyboard
shortcuts for Pro Tools.
Conventions Used in This Guide
Digidesign guides use the following conventions to indicate menu choices and key commands:
:
ConventionAction
File > SaveChoose Save from the File
menu
Control+NHold down the Control key
and press the N key
Control-clickHold down the Control key
and click the mouse button
Right-clickClick with the right mouse
button
The following symbols are used to highlight important information:
User Tips are helpful hints for getting the
most from your Pro Tools system.
Important Notices include information that
could affect your data or the performance of
your system.
PDF versions of the Pro Tools guides are installed automatically with Pro Tools LE. Many
of them are also accessible from the Pro Tools
Help menu. To view or print the PDF guides,
you can use Acrobat Reader or Apple Preview.
Printed copies of the Pro Tools Reference
Guide
and other guides in the Pro Tools
guide set can be purchased separately from
the DigiStore (www.digidesign.com).
Mbox 2 Pro Getting Started6
Shortcuts show you useful keyboard or
mouse shortcuts.
Cross References point to related sections in
this guide and other Digidesign guides.
About www.digidesign.com
The Digidesign Web site (www.digidesign.com)
is your best source for information to help you
get the most out of your Pro Tools system. The
following are just a few of the services and features available.
Registration Register your purchase online. See
the enclosed registration form for instructions.
Support Contact Digidesign Technical Support
or Customer Service; download software updates and the latest online manuals; browse the
Compatibility documents for system requirements; search the online Answerbase; join the
worldwide Pro Tools community on the Digidesign User Conference.
Training and Education Become a certified
Pro Tools Operator or Expert; study on your
own using courses available online, or find out
how you can learn in a classroom setting at a
certified Pro Tools Training Center.
Products and Developers Learn about Digidesign
products; download demo software; learn about
our Development Partners and their plug-ins,
applications, and hardware.
News and Events Get the latest news from Digidesign; sign up for a Pro Tools demo.
To learn more about these and other resources
available from Digidesign, visit the Digidesign
Web site (www.digidesign.com).
Chapter 2: Welcome to Mbox 2 Pro 7
Mbox 2 Pro Getting Started8
chapter 3
Windows Configuration
This chapter contains information for Windows
systems only. If you are installing Pro Tools on a
Mac computer, see Chapter 4, “Mac Configuration.”
Before installing this version of Pro Tools,
refer to the Read Me information included
on the Pro Tools LE Installer disc.
Installation Overview
Installing the Mbox 2 Pro on a Windows computer includes the following steps:
1 “Windows System Optimization” on page 9.
2 “Installing Pro Tools LE and Mbox 2 Pro” on
page 12.
Windows System Optimization
Before configuring your computer, make sure
you are logged in as an Administrator for the account where you want to install Pro Tools. For
details on Administrator privileges, refer to your
Windows documentation.
Required Optimizations
To ensure optimum performance with
Pro Tools LE, configure the following settings
before you install Pro Tools hardware and software.
When you are finished changing Windows
system settings, restart your computer.
3 “Launching Pro Tools LE” on page 14.
4 “Configuring Pro Tools LE” on page 14.
5 Making audio and MIDI connections to the
Mbox 2 Pro. (See Chapter 6, “Making Hardware
Connections” for details.)
Chapter 3: Windows Configuration 9
Enabling DMA
Enabling your computer's DMA (Direct Memory
Access) frees up CPU bandwidth so the computer can do other Pro Tools tasks.
In most cases the DMA option will already be set
correctly, as Windows XP detects and activates
DMA mode by default.
To enable DMA for any IDE hard drives:
1 Choose Start > Control Panel.
2 In Classic View, double-click System.
3 Click the Hardware tab.
4 Under Device Manager, choose Device Man-
ager.
5 In the Device Manager window, double-click
IDE ATA/ATAPI controllers, then double-click
the Primary IDE Channel for your IDE hard
drive.
6 Click the Advanced Settings tab.
To configure Windows Power Management:
1 Choose Start > Control Panel.
2 Double-click Power Options.
3 Click the Power Schemes tab.
4 From the Power Schemes pop-up menu, select
Always On.
5 Click OK.
This sets System Standby, System Hibernate,
and “Turn off hard disks” to Never.
On AMD processors, be sure to check and
disable Cool N’Quiet in the System BIOS (in
the Cool & Quiet Configuration section).
Refer to the manufacturer’s documentation
for instructions on disabling this power option, if necessary.
Disabling ClearType Font Smoothing
When using Pro Tools, the Effects “Clear Type”
setting must be disabled.
7 For each device, set the Transfer Mode to
“DMA if available,” and click OK.
8 Repeat steps 5–7 for any additional IDE Chan-
nels.
9 Close the Computer Management window.
Disabling System Standby and Power
Management
When using Pro Tools, the Windows System
Standby power scheme must be set to Always
On. This helps prevent long record or playback
passes from stopping due to system resources
powering down.
Sleep (or hibernate) settings are supported
when using Mbox 2 Pro and the Windows
System Audio drivers with an application
other than Pro Tools LE.
Mbox 2 Pro Getting Started10
To disable ClearType font smoothing:
1 Choose Start > Control Panel.
2 Double-click Display.
3 Click the Appearance tab.
4 Click Effects.
5 Deselect “Use the following method to
smooth edges of screen fonts.”
6 Click OK to save your settings and close the
Effects dialog.
7 Click OK.
8 Restart the computer.
Recommended Optimizations
Pro Tools can also be affected by other software
and hardware drivers installed on your computer. It is recommended (but not required) that
you do the following:
• Avoid running any unneeded programs at
the same time as Pro Tools.
• Turn off any software utilities that run in
the background, such as Windows Messenger, calendars, and disk maintenance programs.
• Turn off any nonessential FireWire devices
while running Pro Tools.
• If your video display card supports it, enable Bus Mastering in the manufacturer’s
Control Panel. Refer to the manufacturer’s
instructions for details.
Optional Optimizations
The following system optimizations may help
Pro Tools perform better on some systems. It is
recommended that you only try these optimizations if necessary, as they may disable or adversely affect the functionality of other programs on your system.
4 Under the General tab, choose “Do not use
this device (disable)” from the Device Usage
pop-up menu, and click OK.
5 Close the Computer Management window.
Adjusting Processor Scheduling
To Adjust Processor Scheduling Performance:
1 Choose Start > Control Panel.
2 In Classic View, double-click System.
3 Click the Advanced tab.
4 Under the Performance section, click the Set-
tings button.
5 In the Performance Options window, click the
Advanced tab.
6 Under the Processor scheduling section, select
the Background Services option.
7 Under the Memory Usage section, select the
System cache option.
8 Click OK to close the Performance Options
window.
9 Click OK to close the System Properties win-
dow.
Disabling Network Cards
If applicable, disable any networking cards
(other than a FireWire card that you might use
to connect an external drive to your system).
To disable a network card:
1 Right-click My Computer and choose Man-
age.
2 Under System Tools, select Device Manager.
3 In the Device Manager window, double-click
Network adapters, then double-click the Network Adapter card you want to disable.
10 Restart the computer for the changes to take
effect.
Chapter 3: Windows Configuration 11
Disabling Hyper-Threading
Pro Tools LE takes advantage of the added processing power of computers that have multiple
processors, or that feature multi-core processing
or Hyper-Threading, for RTAS processing.
However, if you set the number of processors
available for RTAS processing to 1 (in the
Pro Tools Playback Engine dialog), some computers with hyperthreading capability may experience decreased performance.
If this occurs, you can increase the number of
RTAS processors in the Playback Engine dialog,
or you can disable Hyper-Threading on the computer.
Refer to your computer’s documentation for
steps on how to enter the computer’s BIOS and
disable Hyper-Threading.
Disabling System Startup Items
To Disable System Startup Items:
1 From the Start menu, choose Run.
2 Type “msconfig” and click OK. The System
Configuration Utility opens.
3 Under the General tab, choose Selective
Startup.
4 Deselect Load Startup Items and click OK.
5 Click Restart to restart the computer.
6 After restarting, the computer displays a Sys-
tem Configuration message. Check to see if
Pro Tools performance has increased before you
deselect the “Don't show this message again”
option. If performance has not changed, run
“msconfig” and return your computer Selective
Startup back to Normal Startup. Alternatively,
try disabling Startup items and non-essential
processes individually.
The fewer items in use by your computer, the
more resources are available for Pro Tools. Some
startup applications may be consuming unnecessary CPU resources, and should be turned off.
If you disable any of the following startup items,
do so carefully:
• Portable media serial number (required for
applications that utilize a copy protection
key)
• Plug and play
• Event log
• Cryptographic services
• DHCP Client, TCP/IP Net BIOS, and other
networking-related items (unless the computer has no network or internet connection, in which case these items can be
disabled)
Mbox 2 Pro Getting Started12
Installing Pro Tools LE and
Mbox 2 Pro
To install Pro Tools LE and Mbox 2 Pro:
1 Start Windows, logging in with Administrator
privileges. For details on Administrator privileges, refer to your Windows documentation.
2 Connect the small end of the included
Firewire cable to one of the Firewire ports on
Mbox 2 Pro.
3 Connect the other end of the cable to any
available Firewire (6-pin 1394) port on your
computer. Wait for the Found New Hardware
Wizard dialog to appear and leave it open: Do
not click Next.
Throughout the installation, you should ignore any and all Found New Hardware
Wizard dialogs. Do not click Next.
4 Insert the Pro Tools LE Installer disc for Win-
dows in your CD/DVD drive. Locate and open
the Pro Tools Installer folder, and double-click
the Setup icon.
5 Click Next to begin installation.
6 Select the install location. For maximum reli-
ability, install Pro Tools on your startup drive.
Click Next.
7 Select any options you want to install. For
more information, see “Optional Software on
the Pro Tools Installer Disc” on page 13.
8 Click Next.
If you get a warning dialog about the driver
not passing Windows Logo testing, click
Continue Anyway.
9 Wait for the installer to finish installing all
software components, drivers, and PACE System
files before proceeding to the next step.
10 When installation is complete, click Finish.
Installing QuickTime
QuickTime is required for Pro Tools if you plan
to include movie files, or import MP3 or MP4
(AAC) files in your sessions. The current version
of QuickTime for Windows XP is available as a
free download from the Apple Web site
(www.apple.com).
Optional Software on the
Pro Tools Installer Disc
Your Pro Tools Installer disc includes several
software options.
Pro Tools Demo Session
The Pro Tools LE Installer disc includes a demo
session that you can use to verify that your system is working.
Before installing the demo session to your
audio drive, make sure the drive is configured as described in “Formatting an Audio
Drive” on page 59.
To install the demo session:
1 Insert the Pro Tools LE Installer disc into your
CD/DVD drive.
2 From your CD/DVD drive, locate and open
the Additional Files/Pro Tools LE Demo Session
Installer folder.
3 Double-click Setup.exe.
4 Select your audio drive as the install location
and click Install.
5 When installation is complete, click OK.
MacDrive Demo
To install QuickTime:
1 Visit www.apple.com and go to the Quick-
Time page.
2 Download the QuickTime installer applica-
tion to your computer.
3 Double-click the QuickTime installer applica-
tion and follow the on-screen installation instructions.
4 Restart your computer.
The MacDrive utility lets you mount Mac-based
HFS+ drives on a Windows-based Pro Tools system and use them as Transfer drives.
Transfer drives can be used for storage, but
not for playback or recording. To use Macbased audio files on a Windows Pro Tools
system, copy the files from the Mac-based
HFS+ audio drive to a Windows-based
NTFS audio drive.
Chapter 3: Windows Configuration 13
To install the MacDrive demo included with
Pro Tools:
1 Insert the Pro Tools Installer disc into your
CD/DVD drive.
Configuring Pro Tools LE
Pro Tools System Settings
2 From your CD/DVD drive, locate and open
the Additional Files/MacDrive Demo Installer
folder.
3 Double-click the MacDrive demo installer.
4 Follow the on-screen instructions to install
MacDrive. After installation is complete, restart
your computer.
All formatting and maintenance of HFS+
drives should be carried out when the drives
are connected to a Mac. Do not use the
MacDrive utility to initialize or partition
Mac drives.
Launching Pro Tools LE
When launching Pro Tools LE the first time, you
are prompted to enter an authorization code.
To authorize Pro Tools LE software:
1 Double-click the Pro Tools LE shortcut on
your desktop (or the application icon in the
Pro Tools folder inside the Digidesign folder).
2 Enter the authorization code in the dialog
(making sure to type it exactly as printed, and
observing any spaces and capitalization), then
click Validate.
Your authorization code is located on the inside
front cover of this guide.
Pro Tools LE lets you adjust the performance of
your system by changing system settings that affect its capacity for processing, playback, and recording.
In most cases, the default settings for your system provide optimum performance, but you
may want to adjust them to accommodate large
or processing-intensive Pro Tools sessions.
Hardware Buffer Size
The Hardware Buffer Size (H/W Buffer Size) controls the size of the buffer used to handle host
processing tasks such as Real-Time AudioSuite
(RTAS) plug-ins. The H/W Buffer setting can also
be used to manage monitoring latency.
◆ Lower Hardware Buffer Size settings reduce
monitoring latency, and are useful when you are
recording live input.
◆ Higher Hardware Buffer Size settings allow for
more audio processing and effects, and are useful when you are mixing and using more RTAS
plug-ins.
In addition to causing slower screen response and monitoring latency, higher
Hardware Buffer Size settings can increase
the latency caused by RTAS plug-ins, and
affect the accuracy of plug-in automation,
mute data, and MIDI track timing.
Mbox 2 Pro Getting Started14
To change the Hardware Buffer Size:
1 Choose Setup > Playback Engine.
To set the number of RTAS Processors:
1 Choose Setup > Playback Engine.
2 From the RTAS Processors pop-up menu, select
the number of available processors you want to
allocate for RTAS plug-in processing.
3 Click OK.
If using a single processor computer, be sure
to check the section “Disabling HyperThreading” on page 12 for tips on maximizing performance.
Playback Engine dialog for Mbox 2
2 From the H/W Buffer Size pop-up menu, select
the audio buffer size, in samples.
3 Click OK.
RTAS Processors
The RTAS Processors setting determines the
number of processors in your computer allocated for RTAS plug-in processing.
With computers that have multiple processors,
or that feature multi-core processing or hyperthreading, this setting lets you enable multi-processor support for RTAS processes. Used in combination with the CPU Usage Limit setting, the
RTAS Processors setting lets you control the way
RTAS processing and other Pro Tools tasks are
carried out by the system.
◆ A higher number of processors reserves more
CPU processing capacity for RTAS plug-in processing. This is useful for sessions with large
number of RTAS plug-ins.
◆ A lower number of processors leaves more
CPU processing capacity for automation, screen
redraws, and video playback in Pro Tools, or for
other application running at the same time as
Pro Tools.
CPU Usage Limit
The CPU Usage Limit controls the percentage of
CPU resources allocated to Pro Tools host processing tasks. Used in combination with the
RTAS Processors setting, the CPU Usage Limit
setting lets you control the way Pro Tools tasks
are carried out by the system.
◆ Lower CPU Usage Limit settings limit the ef-
fect of Pro Tools processing on other CPU-intensive tasks, such as screen redraws, and are useful
when you are experiencing slow system response, or when running other applications at
the same time as Pro Tools.
◆ Higher CPU Usage Limit settings allocate
more processing power to Pro Tools, and are
useful for playing back large sessions or using
more real-time plug-ins.
The maximum available CPU Usage Limit depends on the number of processors in your computer and on the number of processors you
specify with the RTAS Processor setting. This
value can be up 99 percent for single-processor
computers or 90 percent for multi-processor
computers.
Increasing the CPU Usage Limit may slow
down screen response on slower computers.
Chapter 3: Windows Configuration 15
To change the CPU Usage Limit:
1 Choose Setup > Playback Engine.
2 From the CPU Usage Limit pop-up menu, se-
lect the percentage of CPU processing you want
to allocate to Pro Tools.
Pro Tools Hardware Settings
Pro Tools lets you set the default sample rate
and clock source for your system, as well as a
range of controls specific to each type of audio
interface.
3 Click OK.
DAE Playback Buffer Size
The DAE Playback Buffer Size determines the
amount of memory DAE allocates for disk buffers. The optimum DAE Playback Buffer Size for
most disk operations is Level 2.
◆ DAE Playback Buffer Size settings lower than
Level 2 may improve playback and recording
initiation speed, but 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 fragmented hard drives.
◆ DAE Playback Buffer Size settings higher than
Level 2 will allow for a higher density of edits in
a session or a higher track count when using
slower hard drives. However, a higher setting
can also cause a time lag to occur when starting
playback or recording, or longer audible time lag
while editing during playback.
Using a larger DAE Playback Buffer Size
leaves less system memory for other tasks.
The default setting of Level 2 is recommended unless you are encountering -9073
(“Disk too slow or fragmented”) errors.
Default Sample Rate
The Sample Rate setting appears as the default
sample rate when you create a new session.
(This setting is available in the Hardware Setup
dialog only when no session is open.)
You can change the sample rate when creating a new Pro Tools session by selecting a
different sample rate in the New Session
dialog. (Refer to
Guide for details.)
To change the default Sample Rate:
1 Choose Setup > Hardware.
Hardware Setup dialog for Mbox 2 Pro
2 Select the sample rate from the Sample Rate
pop-up menu.
3 Click OK.
the Pro Tools Reference
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.
3 Click OK.
Mbox 2 Pro Getting Started16
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