Chapter 29: Plug-in and Hardware Inserts 665
TDM and RTAS Plug-ins
There are three plug-in formats supported by
Pro Tools (TDM, RTAS, and AudioSuite), two of
which can be used as real-time inserts, as fol-
lows:
TDM Plug-ins Used with Pro Tools HD systems,
these plug-ins rely on the processing power of
DSP on Pro Tools|HD system cards.
RTAS Plug-ins Similar to their TDM counter-
parts, but unlike TDM plug-ins, they rely on and
are limited by the host processing power of your
computer.
AudioSuite Plug-ins Non-real-time, file-based
processing plug-ins for Pro Tools (see the Digi-
Rack Guide).
Depending on your Pro Tools software, plug-ins
can be used as follows:
Pro Tools HD
• Both TDM and RTAS plug-ins can be used on
audio, Auxiliary Input, Master Fader, and In-
strument tracks.
Pro Tools LE
• RTAS plug-ins can be used on audio, Auxiliary
Input, Master Fader, and Instrument tracks.
Voice Usage and Total Latency for
RTAS Plug-ins
(Pro Tools HD Only)
With Pro Tools HD, the initial insert of an RTAS
plug-in may cause additional latency, and will
take up two additional voices per channel (one
voice for input and one voice for output) in the
following conditions:
• When inserted on an Auxiliary Input or
Master Fader track
• When inserted on an Instrument track that
does not contain an instrument plug-in
• When inserted after a TDM plug-in on any
kind of track
For example, the initial insert of an RTAS plug-
in on a mono Auxiliary Input track uses two
voices (one channel with two voices), while the
initial insert of that plug-in on a stereo Auxiliary
Input track uses four voices (two channels with
two voices each).
Subsequent RTAS plug-ins on the same track do
not take up additional voices unless a TDM
plug-in is inserted between other RTAS plug-ins.
With Pro Tools HD, RTAS plug-ins placed
on Auxiliary Input, Master Fader, and In-
strument tracks will use additional voices
and may introduce extra latency based on
the HW Buffer Size. For more information,
see “Voice Usage and Total Latency for
RTAS Plug-ins” on page 665.
For tips on maximizing RTAS performance,
see the DigiRack Plug-ins Guide.
Avoid inserting TDM plug-ins between
RTAS plug-ins on any kind of track—this
causes unnecessary voice usage and may
cause additional latency.
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