Specifications

Chapter 10: Using ReWire with Pro Tools 137
ReWire Requirements
To use the ReWire plug-in, you will need:
• A Digidesign-qualified Pro Tools system
• ReWire-compatible client software (such as
Reason from Propellerheads Software)
ReWire support is also under development for
other third-party companies. For availability,
check with the manufacturer or visit the Digide-
sign website (www.digidesign.com).
ReWire and Track Count with
Pro Tools HD
With Pro Tools HD, the ReWire RTAS plug-in
can be inserted on any kind of 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 sys-
tem, that will leave 88 channels of audio (88
mono, or 44 stereo) available for use with Re-
Wire. (However, ReWire only supports a maxi-
mum 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
With Pro Tools LE, performance is determined
by several factors, including host CPU speed,
available memory, and buffer settings. Digide-
sign cannot guarantee 64 simultaneous audio
channel outputs with ReWire on all computer
configurations.
For the latest information on recommended
CPUs and system configurations, visit the
Digidesign website (www.digidesign.com).
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.
With Pro Tools HD, the standard Hardware
Buffer size of 512 samples is strongly rec-
ommended for using ReWire in sessions
with sample rates above 48 kHz.