DigiDesign Mbox 2 Mini Setup Manual page 39

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. The number of processors available varies depending
on how many processors are available on your computer:
• Select 1 Processor to limit RTAS processing to one CPU in the system.
• Select 2 Processors to enable load balancing across two available processors.
• On systems running four or more processors, select from the available number of RTAS
processors.
3 Click OK.
CPU Usage Limit
The CPU Usage Limit controls the percentage of CPU resources allocated to Pro Tools host pro-
cessing tasks. Used in combination with the RTAS Processors setting, the CPU Usage Limit set-
ting lets you control the way Pro Tools tasks are carried out by the system.
Lower CPU Usage Limit settings limit the effect of Pro Tools processing on other CPU-inten-

sive tasks, such as screen redraws, and are useful when you are experiencing slow system re-
sponse, 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 com-
puter and on the number of processors you specify for RTAS processing. This value can range
from 85 percent for single-processor computers to 99 percent for multi-processor computers.
Increasing the CPU Usage Limit may slow down screen response on slower computers.
Chapter 4: Configuring Your Pro Tools System 29