MOTU Traveler-mk3 User Manual page 32

To synchronize multiple devices via the MOTU
FireWire driver, choose one device (PCI, FireWire
or otherwise) as the master clock and then slave the
Traveler-mk3 and other FireWire devices to it. All
interfaces will remain resolved to each other via the
master interface.
Make the Clock Source settings for each interface
as follows:
For the master interface, click its tab in MOTU
■
Audio Setup and choose any clock source you wish
(except any of the slave interfaces, of course).
For each slave interface, click its tab and choose
■
the master interface from the Clock Source menu, as
demonstrated below in Figure 3-23. This causes
the slave interfaces to resolve to the master
interface.
Figure 3-23: To resolve a MOTU FireWire interface to another Core
Audio device, choose the other device from the Clock Source menu in
the MOTU Audio Setup. In this example, the Traveler-mk3 will slave to
the 828mk3.
If you have multiple Traveler-mk3s, choose one as
the master, and set its Clock Source to Internal.
Then, click the tab of the other Traveler-mk3s and
set their Clock Source to the first Traveler-mk3.
32
Resolving to word clock
To resolve two Traveler-mk3 FireWire interfaces
with each other via word clock, choose one as the
word clock master and then slave the second
interface to the first, as shown in Figure 3-21 on
page 31. For three interfaces, you can probably get
away with daisy-chaining them via their word
clock connectors, but this may not always produce
the most reliable results. For three or more devices,
a word clock distribution device is highly
recommended. In this case, the distribution box is
the master, and all FireWire interfaces slave directly
to it (instead of to each other).
Connecting other MOTU FireWire interfaces
You can add an original MOTU 828 to the end of a
FireWire daisy chain (because the 828 has only one
FireWire port), or you can mix and match multiple
828's with other MOTU FireWire interfaces using a
standard FireWire hub. Alternately, can daisy-
chain any MOTU audio interface with two
FireWire ports.
Operating multiple FireWire interfaces at high
sample rates
Four MOTU FireWire interfaces can operate at
44.1 or 48kHz on a single FireWire bus, although
you may have to disable optical banks to conserve
FireWire bus bandwidth. At the 2x samples rates
(88.2 or 96kHz) and 4x sample rates (176.4 and
192kHz), you can operate no more than two
FireWire interfaces on a single FireWire bus.
Adding additional interfaces with a second
FireWire bus
Third-party FireWire bus expansion products in
the form of a cardbus ("PC card"), ExpressCard or
PCI card adapter allow you to add a second
FireWire bus to your computer. In may be possible
to add additional MOTU FireWire interfaces
connected to such a product, depending on their
performance with your host computer.
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