Specifications

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Chapter 4: Mac Conﬁguration 23

Conﬁguring Pro Tools LE

Pro Tools System Settings

Pro Tools LE lets you adjust the performance of

your system by changing system settings that af-

fect its capacity for processing, playback, and re-

cording.

In most cases, the default settings for your sys-

tem 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) con-

trols 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 use-

ful when you are mixing and using more RTAS

plug-ins.

To change the Hardware Buffer Size:

1 Choose Setup > Playback Engine.

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 allo-

cated for RTAS plug-in processing.

With computers that have multiple processors,

or that feature multi-core processing or hyper-

threading, this setting lets you enable multi-pro-

cessor support for RTAS processes. Used in com-

bination 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 pro-

cessing. This is useful for sessions with large

number of RTAS plug-ins.

In addition to causing slower screen re-

sponse 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.

Playback Engine dialog for Mbox 2 Mini