Chapter 3: Installation Overview
19
3
Click on the Analog In tab to access the radio
buttons with which to select your input operat-
ing levels for each channel.
4
Click OK to leave the Hardware Setup dialog.
Synchronization Mode and
Clock Source
The 96 I/O lets you resolve your Pro Tools|HD
system to most digital clock references in use in
today's complex, multi-unit production envi-
ronments.
The Hardware Setup dialog lets you specify
among digital input sources and select a clock
source.
Choices for Clock Source vary depending on
Sample Rate and the Digital Format that is en-
abled (AES/EBU, S/PDIF, or Optical S/PDIF).
Pro Tools|HD and the 96 I/O give you multiple
clock reference choices at all sample rates and
digital format settings.
To choose a clock source:
1
Launch Pro Tools.
2
Choose Setups > Hardware Setup.
3
Select a Digital Format from the port choices:
AES/EBU, S/PDIF, or Optical (ADAT).
4
Click the Clock Source pop-up menu and se-
lect a synchronization mode. If the desired clock
is not listed, check your Digital Format setting
to be sure you have enabled the appropriate dig-
ital port and format. Choices for Clock Source
also vary depending on Sample Rate.
5
Click OK to close the Hardware Setup dialog
when you have finished.
Your choice depends on which device in your
setup you want to make the master clock device.
6
96 I/O can only be the clock source when it is
the master audio interface. If you choose a clock
source on another HD I/O other than the Loop
Master, Pro Tools will automatically designate
the new interface as the Loop MASTER periph-
eral, switch to it for the chosen Clock Source,
and set all other HD I/Os to Loop Slave mode.
Clock Source and Loop Master
In the Hardware Setup dialog, you can set the
clock source to be available from any HD I/O.
Choosing to use a Clock Source will, in ex-
panded I/O systems, automatically make that
I/O the Loop Master. The LOOP MASTER LED
will light on the front of the Loop Master I/O.
Because any HD I/O can be the Loop Master,
you can use any of the digital ports on any HD
I/O as your system clock source.
Digital Format
The Digital Format section enables you to
choose which port the 96 I/O will use for digital
audio input and/or word clock input. For exam-
ple, to record digitally from an optical S/PDIF
device connected to the Optical In port, enable
the Optical (S/PDIF) option for Digital Format.
Only one digital input port can be used at a
time, although the AES/EBU and S/PDIF
outputs
are mirrored at all times.
Clock Source
The Clock Source selector lets you choose
among available digital clock choices to deter-
mines which HD-series interface, and which
specific digital port on that interface, is provid-
ing clock to Pro Tools. Choices will include 1x
Word at the session sample rate or base rate (for
clocking to house video reference or other Word
