5.1 DigiRack Plug-Ins Guide - Digidesign Support Archives

3 From the CPU Usage Limit pop-up, select the
percentage of CPU power you want to dedicate
to RTAS plug-ins and host processing.
4 Click OK.
For more information on the Hardware
Buffer Size and CPU Usage Limit parameters,
see the Pro Tools Reference Guide.
Delay in Digital Signal
Processing
(TDM Plug-Ins Only)
DSP processing in digital audio systems incurs
signal delay of varying amounts. Such delays
can vary from as short as several microseconds
to as long as several milliseconds, depending on
the type of processing applied.
Delays are a matter of concern only if you use a
real-time TDM plug-in on one channel of a
multi-channel signal but not the others. This
can cause the channels to be slightly out of
phase.
If you are working with mono tracks, or are processing
all channels with the same plug-ins,
these signal delays should not be a matter of
concern.
See Appendix B, “DSP Delays Incurred by
TDM Plug-Ins” for information on delays
inherent in specific DigiRack TDM plugins.
See also the Pro Tools Reference Guide
for a guide to calculating DSP-induced delays.
Compensating with TimeAdjuster
You can compensate for TDM plug-in-induced
delays by using the TimeAdjuster plug-in. This
plug-in allows you to apply a specific number of
samples of delay to the signal path of a Pro Tools
track. TimeAdjuster provides settings files that
apply the correct compensation time in samples
for delay introduced by one or more plug-ins.
See “TimeAdjuster” on page 39.
Plug-Ins as Inserts
Real-time plug-ins are available as in-line inserts
on audio tracks, auxiliary inputs, and master
faders. A maximum of 5 real-time plug-ins can
be used per track.
When more than one insert is used on a track,
they process the audio in series, each effect being
added to the previous one, from top to bottom
in the Mix window.
If you are using both TDM and RTAS plugins
on the same track, RTAS plug-ins must
occur first in the signal chain, followed by
TDM plug-ins. You cannot place TDM
plug-in inserts before RTAS plug-in inserts.
Inserts can be used in two ways:
On single tracks An insert can be applied to an
individual audio track or auxiliary input using
the Insert Selector on that track.
With in-line inserts, you control the level of effect
by adjusting the controls of the plug-in.
As shared resources An insert can be used as a
shared resource in a send-and-return arrangement
by bussing signals from several tracks to
an auxiliary input, and applying the insert to
Chapter 2: Working with Real-Time Plug-Ins 5