Specifications

Pro Tools Reference Guide552
To show Time Code Settings section:
■ Click the Time Code Settings Expand/Col-
lapse icon.
The controls in this section provide time code
generation and freewheel options, and separate
pull up and down selectors for audio and video
rates.
Session Displays and Settings
Sample Rate
This display indicates the sample rate for the
current session.
Bit Depth
This display indicates the bit depth for the cur-
rent session.
Audio Format
This display indicates the file format for files re-
corded in the session.
Mac<->PC
This display indicates whether Pro Tools is set to
create sessions and audio files that are usable on
both Windows and Macintosh.
Clock Source (Sync Mode)
Use this menu to configure the system Clock
Source. You can choose between a SYNC I/O, an
internal clock source from a digidesign card or
peripheral, or an external clock source con-
nected to an HD-series audio interface.
Clock Source Options
SYNC I/O When using a Digidesign SYNC I/O,
Pro Tools receives its clock source from the
SYNC I/O, and the SYNC I/O can in turn refer-
ence an external clock source listed in the SYNC
setup selector.
Internal Mode In Internal mode, your system
will reference your Digidesign card or periph-
eral’s quartz crystal oscillator and play back at
the session’s sample rate.
External Clock Sources Depending on your HD-
series audio interface, external Clock Source op-
tions can include AES/EBU [Encl.], S/PDIF, Opti-
cal [Encl.], AES/EBU 1-8, TDIF, ADAT, and Word
Clock (optional word clock rates are available at
higher frequencies). External sources can be 1x
any sample rate or the “base” rate. Base rate
equals 44.1 kHz for 88.2 and 176.4 kHz; 48 kHz
for 96 and 192 kHz. If an external source is cho-
sen, and no valid sync clock is detected at the
External Clock In, the I/O will return to Internal
mode.
For more information on external clock sources,
see the SYNC I/O Guide.
System Delay
This display indicates the total amount of sys-
tem delay (in samples) caused by plug-ins and
mixer routing.
Fader Gain
This display indicates the maximum fader gain
level for the session.
Changes made to Clock Source in the Hard-
ware Setup window will be reflected in the
Session Setup window and vise versa.
If SYNC I/O is enabled in the Peripherals di-
alog, and is correctly connected in the Loop
Sync chain, SYNC I/O can be the Loop Mas-
ter, and HD I/Os will clock as Loop Sync
slaves.