User Manual

MOTU AUDIO SETUP
27
96 kHz). In ADAT optical clock mode, the 8pre
always resolves to the optical input in the top row,
even during 88.2 or 96 kHz operation. So be sure to
connect the ADAT optical clock master to the
optical input in the top row.
If the ADAT Optical setting does not appear in the
menu, it means that the 8pre’s optical input is
currently turned off. Choose the ADAT optical
format from the Optical input menu (Figure 5-1 on
page 26).
For further details about this setting, see “Syncing
optical devices” on page 20.
SMPTE
Choose this setting to resolve the 8pre directly to
SMPTE time code (LTC) being received via any
analog input. For details, see chapter 12, “MOTU
SMPTE Setup” (page 59).
Macintosh built-in
Choose this setting to resolve the 8pre to your
Mac’s built-in audio. Doing so will ensure that
audio streams playing back from or recorded by
the 8pre will not drift apart from audio streams
simultaneously played or recorded by the Mac’s
built-in mic, speakers or audio output.
Other audio devices (drivers)
The MOTU FireWire Audio Driver has the ability
to resolve to other Core Audio drivers. Doing so
will ensure that audio streams playing back from or
recorded by the 8pre will not drift apart from audio
streams simultaneously played or recorded by the
other devices.
Default Stereo Input/Output
In the System Preferences window, Mac OS X lets
you choose third-party hardware such as the 8pre
for your Macintosh sound input and output. The
system input and output can be used for alert
sounds and general audio I/O for applications like
iTunes, iMovie, etc.
Figure 5-2: The Mac OS X sound preferences let you use the 8pre for
general stereo audio input and output for your Mac.
The Default Stereo Input and Default Stereo Output
settings in MOTU Audio Setup (Figure 5-1 on
page 26) let you specify the stereo input and output
on the 8pre to be used when it is chosen as the
audio I/O device in the system preferences.
Optical input/output
The Optical input and Optical output settings let
you enable or disable the optical ports. For
example, when operating the 8pre as an audio
interface, you can conserve FireWire bus
bandwidth by disabling the optical ports when
they are not in use. This frees up the FireWire bus
for other devices that may also be connected to the
bus (such as additional interfaces).
!8pre Manual/Mac Page 27 Tuesday, October 12, 2010 5:52 PM