Specifications

DigiRack Plug-Ins Guide74
ReWire Requirements
To use the ReWire plug-in, you will need:
•A Digidesign-qualified Windows or Macin-
tosh computer running Pro Tools TDM or
Pro Tools LE software version 6.1 or higher.
• ReWire-compatible client software, such as:
• Reason from Propellerheads Software
• Live from Ableton
ReWire support is also under development for
other third-party companies. For availability,
check with the manufacturer or the Digidesign
Web site (www.digidesign.com).
ReWire and Track Count on TDM
Systems
On TDM systems, the ReWire RTAS plug-in
must be inserted on an audio track. Each chan-
nel of audio transmitted through ReWire then
uses the same amount of resources as the audio
track on which it is inserted.
Consequently, you can only use a total combi-
nation of audio tracks and ReWire audio streams
that does not exceed the maximum number of
possible voices for your system. For example, if
you are playing 40 audio tracks in a 48 kHz/24-
bit session on a 128-voice Pro Tools|HD 2 core
system, that will leave 88 channels of audio (88
mono, or 44 stereo) that can be used with Re-
Wire. (ReWire supports a maximum of 64 audio
streams per application.)
Using ReWire at higher sample rates will in-
crease the load on the CPU. For example, CPU
load at 96 kHz is double the load at 48 kHz. You
can monitor Pro Tools CPU usage in the System
Usage window, making sure to not overtax your
system.
ReWire and Track Count on
Pro Tools LE Systems
On Pro Tools LE-based systems, performance is
determined by several factors, including host
CPU speed, available memory, and buffer set-
tings. Digidesign cannot guarantee 64 simulta-
neous audio channel outputs with ReWire on all
computer configurations.
For the latest information on recommended
CPUs and system configurations, check the
Digidesign Web site (www.digidesign.com/com-
pato).
Client software must support the same
sample rate as the session using ReWire.
For example, third-party client software
that does not support sample rates beyond
48 kHz cannot be used in 96 kHz Pro Tools
sessions.
The standard Hardware Buffer size of 512
samples is strongly recommended for using
ReWire in sessions with sample rates above
48 kHz on Pro Tools|HD systems.