User Manual

Chapter 47: HEAT 1035
A Note About Other Track
Types
HEAT only affects audio tracks. It is not applied to
Instrument, Auxiliary Input, or Master tracks. If
you are using virtual instrument plug-ins on an In-
strument or Auxiliary Input track and want to ap-
ply HEAT, you can either bus record audio from
that track to an audio track, or you can bus the out-
put of the track to the input of an audio track and
enable Input monitoring.
DSP and Voice Requirements
(HDX Systems Only)
The amount of DSP resources used by HEAT is
based on the number of voices used for audio
tracks, the type of DSP hardware, and the session
sample rate.
The following table lists the number of mono au-
dio tracks per DSP chip that are available with
HEAT processing enabled.
Stereo tracks require twice the DSP of mono
tracks, and surround formats require as much DSP
per channel as the corresponding number of mono
tracks (for example, a 5.1 track uses the same
amount of DSP as 6 mono tracks).
Insufficient DSP Resources
It is possible that your system may have insuffi-
cient DSP resources to add more audio tracks to
the session when HEAT is enabled (because there
is not enough DSP available for HEAT on the new
tracks). Should this occur, Pro Tools prompts you
to do one of the following:
• Create the new tracks, but make them inactive.
(Inactive audio tracks do not use any DSP re-
sources.)
• Disable HEAT and create the new tracks.
When opening a session that was saved with
HEAT enabled, but your system does not have
enough DSP to apply HEAT to all active audio
tracks in the session, HEAT is automatically dis-
abled. The session notes dialog will indicate that
HEAT has been made inactive.
Once the session is open, you can manage which
tracks you want to have active with HEAT enabled
within the DSP limitations of your system. You
can also expand your HDX system with additional
cards to increase the available DSP resources for
HEAT.
In some cases, if the session you are opening has a
lot of active DSP plug-ins, the session may open
with HEAT enabled, but make some of the ses-
sion’s DSP plug-ins inactive. This is because
HEAT processing takes priority over DSP plug-in
processing.
Available number of mono audio tracks per DSP chip
DSP Chip
Type
44.1/
48 kHz
88.2/
96 kHz
176.4/
192 kHz
HDX 86 42 19