Specifications

Chapter 86: ReWire 479
ReWire Requirements
To use the ReWire plug-in, you will need:
• An Avid-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 Avid
website (www.avid.com).
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 combina-
tion 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.
Track Count with Pro Tools Host-based
Systems
With Pro Tools host-based systems, perfor-
mance is determined by several factors, includ-
ing host CPU speed, available memory, and buf-
fer settings. Avid cannot guarantee 64
simultaneous audio channel outputs with Re-
Wire on all computer configurations.
For the latest information on recommended
CPUs and system configurations, visit the Avid
website (www.avid.com).
Using ReWire
The ReWire plug-in is installed when you install
Pro Tools. All inter-application communica-
tions between Pro Tools and ReWire client soft-
ware is handled automatically.
To use a ReWire client application with Pro Tools:
1 Make sure that the ReWire client application is
installed properly and that you have restarted
your computer.
2 In Pro Tools, choose Track > New and specify
one Instrument track (or audio or Auxiliary In-
put track), and click Create.
Client software must support the same sam-
ple rate as the session using ReWire. For ex-
ample, third-party client software that does
not support sample rates above 48 kHz can-
not be used in a 96 kHz Pro Tools session.
With Pro Tools HD, the standard Hardware
Buffer size of 512 samples is strongly recom-
mended for using ReWire in sessions with
sample rates above 48 kHz.