M-AUDIO Pro Tools Recording Studio - Manual (Page 918)

Pro Tools Reference Guide 900
Using External Clock Sources (for
Recording and Monitoring)
When recording or monitoring, Pro Tools can
synchronize to an external clock source. Op-
tions for external clock vary according to the
type of Pro Tools system you are using.
Pro Tools|HD Systems
Pro Tools|HD systems can receive external clock
through any of the digital inputs on any
Pro Tools|HD I/O (including AES/EBU, S/PDIF,
and Optical).
With an expanded Pro Tools|HD system that in-
cludes Legacy interfaces (such as the 888|24
I/O), connect to the digital input on Channels
1–2 of the Legacy audio interface in order to
clock from them. Legacy I/Os only support
44.1 kHz and 48 kHz sample rates.
To select an external clock source for a
Pro Tools|HD system:
1 Choose Setup > Hardware.
2 Select the appropriate Pro Tools|HD I/O in or-
der to display its settings in the Main page.
3 If necessary, enable the appropriate Digital
Format (if you have not already done so, accord-
ing to the instructions in your Setup Guide or I/O
Guide).
4 Set the Clock Source to match the type of
input.
5 Configure input routing of the digital source,
using the Input and Output pop-up menus, if
necessary.
6 Click OK to close the Hardware Setup dialog.
003, 003 Rack+, 003 Rack, Digi 002, or
Digi 002 Rack Systems
Pro Tools can receive external clock from the
Optical input or S/PDIF input.
To select an external clock source for 003,
003 Rack+, 003 Rack, Digi 002, or Digi 002 Rack
system:
1 Choose Setup > Hardware.
2 Set the Clock Source to match the type of in-
put.
3 If you select Optical, make sure the Optical For-
mat matches the type of optical input you are
sending to your Pro Tools system.
Mbox 2 Pro, Mbox 2, and Mbox Systems
Pro Tools can receive external clock from the
S/PDIF input on these interfaces.
To select an external clock source for an Mbox 2
Pro,
Mbox 2, or Mbox system:
1 Choose Setup > Hardware.
2 Select SPDIF (Windows) or SPDIF/RCA (Mac)
from the Clock Source pop-up menu.
3 Click OK.
If you set the Optical Format to S/PDIF,
Pro Tools will watch the Optical port for
any audio input, and ignore any audio in-
put on the S/PDIF RCA jacks.
To determine correct card order and audio
interface connections, refer to the
Pro Tools|HD Setup Guide.
If you set the Optical Format to S/PDIF,
Pro Tools will watch the Optical port for ex-
ternal clock, and ignore any clock input on
the S/PDIF RCA jacks.
Your digital input device must be connected
and powered on for Pro Tools to synchro-
nize to it. If your input device is not powered
on, leave the Clock Source set to Internal.