M-AUDIO Pro Tools Recording Studio - Manual (Page 1030)

Pro Tools Reference Guide 1012
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.
Clock Source
Use this menu to configure the system Clock
Source. You can choose between a SYNC periph-
eral, an internal clock source from a Digidesign
peripheral, or an external clock source con-
nected to a Pro Tools|HD audio interface.
Clock Source Options
SYNC When using a SYNC Peripheral, Pro Tools
receives its clock source from the SYNC periph-
eral. The SYNC Peripheral can in turn reference
an external clock source, selected in the SYNC
Setup section of the Session Setup window.
Internal In Internal mode, your system refer-
ences your Digidesign peripheral’s internal
clock and plays back at the session’s sample rate.
External Clock Sources Depending on your
Pro Tools|HD audio interface, external Clock
Source options can include AES/EBU, S/PDIF,
S/PDIF Optical
, ADAT Optical, TDIF, and Word Clock
(optional word clock rates are available at higher
session sample rates). External sources can be
any multiple of the “base” rate. The base rate is
44.1 kHz for 88.2 and 176.4 kHz sources. The
base rate is 48 kHz for 96 and 192 kHz sources. If
an external source is chosen and no valid sync
clock is detected at the External Clock In, the
I/O reverts to Internal mode.
System Delay
When Delay Compensation is enabled (Options
> Delay Compensation
), this display indicates the
total amount of delay (in samples) applied by
the system to compensate for plug-ins and
mixer routing delays.
Session Start
Use this field to specify a SMPTE start frame edge
location for your session. See “Setting a SMPTE
Session Start Time (Start Frame)” on page 1016.
Incoming Time (Current Time)
This display indicates incoming time code from
an external source (such as a VTR).
Changes made to Clock Source in the
Hardware Setup dialog will be reflected in
the Session Setup window and vice versa.
If a SYNC Peripheral is enabled in the
Peripherals dialog, and is correctly
connected in the Loop Sync chain, the
SYNC peripheral can be the Loop
Master, and Pro Tools|HD audio
interfaces will clock as Loop Sync slaves.
For more information on external clock
sources, refer to your SYNC peripheral
documentation.