Specifications

Pro Tools|HD Getting Started Guide46
The Main page also provides controls for defin-
ing whether Expansion Port or Legacy Port pe-
ripherals are active.
Additional pages are available to configure other
controls for each audio interface (such as setting
operating levels).
Identifying Audio Interfaces
If you have multiple audio interfaces of the
same type connected to your system, before you
make audio connections to them, you should
confirm the identity of each interface. This en-
sures that you choose the appropriate interface
in the Peripherals list when you define its inputs
and outputs in the Hardware Setup dialog.
To identify audio interfaces in your system:
1 Choose Setup > Hardware.
2 From the Peripherals list, select an audio inter-
face connected to your system.
3 Make sure the Main page tab is chosen.
4 Select the Identify option, located in the lower
left corner of the Hardware Setup dialog. This il-
luminates all the LEDs on the front panel of the
selected audio interface.
5 Make a note of which interface in your studio
setup corresponds to the identified interface.
6 Repeat the above steps for each additional au-
dio interface in your setup.
To configure Pro Tools|HD audio interfaces:
1 Choose Setup > Hardware.
2 From the Peripherals list, select the Digidesign
audio interface connected to the first card in
your system. This will be the interface at the top
of the list.
3 Click the Main tab.
4 From the Clock Source pop-up menu, select
the appropriate clock source for the interface.
In many cases, you will use Internal. The other
choices are for resolving Pro Tools to external
clock sources. Depending on your audio inter-
face, Clock Source options can include: AES/EBU
[Encl], S/PDIF, Optical [Encl], AES/EBU 1–8,
TDIF, ADAT, and Word Clock (optional Word
Clock rates are available when operating at
higher sample rates).
5 If you want to send clock output to other de-
vices attached to the audio interface, select the
appropriate output from the Ext. Clock Output
pop-up menu.
If the Legacy I/O Port is enabled (and not the
Expansion I/O Port) then the Ext. Clock Output
automatically switches to Slave Clock (256x
sample rate). To reset the Ext. Clock Output to
Word Clock, change the Port Settings back to
Expansion I/O, then select the Legacy I/O in the
Peripherals list, and set it to No Interface in the
Interface pop-up menu. (The 96i I/O does not
support Legacy I/O.)
Use the Up and Down Arrow keys to scroll
though the Peripherals list in the Hardware
Setup dialog.
Legacy I/Os must be initialized in the Pe-
ripherals list before they can be identified.
See “Configuring Legacy I/Os” on page 50.