Setup guide

Chapter 4: Configuring Your Pro Tools System 51
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 sam-
ple 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.)
6 Select which digital I/O port on your audio in-
terface enclosure is active by selecting an option
under Digital Format. Depending on the type of
interfaces in your system, choices include
AES/EBU, S/PDIF, and Optical (S/PDIF). Selecting
Optical (S/PDIF) resets the Optical I/O port
(which is, by default, eight channels of
ADAT Optical I/O) to two channels of
S/PDIF Optical I/O. (The 96i I/O supports stereo
S/PDIF RCA digital input and output only.) For
more information about Pro Tools|HD enclosure
and card ports, refer to the guide for your audio
interface.
7 For S/PDIF compatibility with Tascam DA-30
DAT recorders, select the Tascam option under
S/PDIF Format.
8 For the 96 I/O and 96i I/O, click the Meters
pop-up menu and select whether to meter the
input or output signal.
9 From the Input and Output channel pop-up
menus, select the physical ports (such as Analog
1–2 or Optical 1–2), that will be routed to the
corresponding Pro Tools input and output chan-
nels (such as Ch 1–2, Ch 3–4), listed on the left
side of the Main page. (This feature is not avail-
able with the 96i I/O.)
Inputs and outputs of similar format are differ-
entiated in the input and output channel pop-
up menus. For example, the AES/EBU inputs and
outputs in the 192 I/O enclosure are listed as
AES/EBU [Encl], while the AES/EBU inputs and
outputs on the factory-installed Digital I/O card
are listed (in pairs) as AES/EBU 1–2, AES/EBU
3–4, AES/EBU 5–6, and AES/EBU 7–8. For
192 I/Os equipped with the optional Digital I/O
Card, the additional AES/EBU I/O ports on the
optional card are listed as AES/EBU 9–10,
AES/EBU 11–12, AES/EBU 13–14, and AES/EBU
15–16.
10 Configure controls for your Pro Tools|HD au-
dio interface. See “Configuring 192 I/O and
192 Digital I/O Controls” on page 52, “Config-
uring 96 I/O Controls” on page 53, and “Con-
figuring 96i I/O Controls” on page 53.
11 For additional Pro Tools|HD interfaces,
choose the interface in the Peripherals list, and
repeat the above steps.
Refer to your peripheral’s guide for configu-
ration details and restrictions. For example,
the Optical 1–8 channels (on the 192 I/O
enclosure) will not be available at session
sample rates of 88.2 kHz or higher, while
the ports on the 192 I/O Digital I/O card
will still be available.