Specifications

Pro Tools Reference Guide70
To change the Number of Voices and DSP to
allocate for voicing:
1 Choose Setup > Playback Engine.
2 Select the number of voices and DSPs to allo-
cate for voicing by selecting a value from the
Number of Voices pop-up menu as follows:
• Select minimum voice numbers if you are using
high-bandwidth PCI or PCIe cards (such as
video capture cards) along with your Avid HDX
or Pro Tools|HD cards. These settings place the
lightest processing load on each allocated DSP
chip, but generally require more DSP chips be
dedicated to voicing and mixing (leaving fewer
available for plug-ins).
• Select medium voice numbers when your
Pro Tools|HD cards are in an expansion chassis,
or when you are using other PCI or PCIe cards
along with Avid HDX or Pro Tools|HD cards.
These settings generally provide an optimum
balance between number of chips needed for
voicing, and the processing load placed on each.
• Select higher voice numbers when your Avid
HDX or Pro Tools|HD cards are the only PCI or
PCIe cards in your computer, or when you are
using an expansion chassis to run higher track
counts (such as 64 tracks at 96 kHz) and you
want more voices per DSP (such as 16 voices per
DSP at 96 kHz). These settings use fewer DSP
chips for mixing (leaving more available for
plug-ins) but place the highest processing load
on each.
3 Click OK.
Sample Rate (Playback Engine)
(Avid HDX and Pro Tools|HD Systems Only)
The Sample Rate setting in the Playback Engine
determines the default sample rate when you create
a new session. This setting is available only when
there is no session open. Otherwise, the current
session sample rate is displayed, but cannot be
changed.
To change the default Sample Rate in the Playback
Engine:
1 With no session open, choose Setup > Playback
Engine
.
2 Select the sample rate from the Sample Rate
pop-up menu.
3 Click OK.
The Sample Rate setting can affect the
number of available voices.
You can change the sample rate when
creating a new Pro Tools session by selecting
a different sample rate in the New Session
dialog. (
See “Creating a New Session”
on page 168.)
You can also change the de-
fault Sample Rate in the Hardware Setup, as
long as no session is open.
To make a copy of a session with a new
sample rate, use Save Copy In.