Getting Started with Digi 002 & Digi 002 Rack26
When the download and reprogramming pro-
cess is complete, you may get a message that
Pro Tools cannot communicate with Digi 002 or
Digi 002 Rack. In this case, wait up to 30 sec-
onds. If the message does not go away, discon-
nect then reconnect Digi 002 or Digi 002 Rack
and click OK.
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 hardware cache used to han-
dle host processing tasks such as Real-Time Au-
dioSuite (RTAS) plug-ins.
◆ 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 Setups > Playback Engine.
2 From the H/W Buffer Size pop-up menu, select
the audio buffer size, in samples.
3 Click OK.
CPU Usage Limit
The CPU Usage Limit controls the percentage of
CPU resources allocated to Pro Tools host pro-
cessing tasks.
◆ Lower CPU Usage Limit settings limit the ef-
fect 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 CPU Usage Limit is 85 percent
for single-processor computers, and 99 percent
for multi-processor computers. (The 99 percent
setting dedicates one entire processor to
Pro Tools.)
In addition to causing slower screen re-
sponse and monitoring latency, higher
Hardware Buffer Size settings can affect the
accuracy of plug-in automation, mute data,
and timing for MIDI tracks.
Playback Engine dialog (Digi 002 shown)
Increasing the CPU Usage Limit may slow
down screen responses on slower computers.