User Manual-Windows

MOTU PCI AUDIO CONSOLE
66
The 24I/O: Word Clock In setting is unique because
it switches the operation of the single BNC word
clock connector on the 24I/O interface. When you
choose the 24I/O: Word Clock In setting, the 24I/O’s
word clock jack becomes a word clock input. When
you choose any other clock source setting, it
operates as a word clock output.
2408mk3: Bank A/B/C Optical In
These settings refer to the clock provided by the
ADAT optical inputs on the 2408mk3 interface.
This setting can be used to slave the entire PCI-424
system directly to an optical input connection.
These settings are useful if you just need to make a
simple, click-free digital transfer between the
2408mk3 and another device — where a time code
reference and shared transport control are not
needed — without having to set up a full-fledged
synchronization scenario.
In many cases, you can set up a better operating
scenario that uses one of the other synchronization
options. However, there may be occasions when
you have an ADAT optical compatible device that
has no way of synchronizing digitally to the
2408mk3 or an external synchronizer such as the
Digital Timepiece. In this case, the “Bank A/B/C
Optical In” setting lets you slave the 2408mk3 to
the device itself via its digital input to the 2408mk3.
Note: TDIF can’t be used as a clock source
Please note that TDIF cannot be used as a clock
source. This is because the TDIF I/O format does
not contain a stable clock source. Therefore, if you
have selected TDIF as the audio format for one of
the three banks, and you then try to choose ADAT
optical from that bank as the clock source, the PCI
Audio Console will alert you that it cannot use the
TDIF input as a clock source.
2408mk3: SPDIF
This setting refers to the SPDIF RCA input
connector on the 2408mk3 interface. This setting
allows the entire PCI-424 system (including other
2408mk3 I/Os connect to the PCI-424 card) to
slave to another SPDIF device.
Use this setting whenever you are recording input
from a DAT deck or other SPDIF device into the
2408mk3. It is not necessary in the opposite
direction (when you are transferring from the
2408mk3 to the DAT machine).
HD192: Bank C AES/EBU
This setting refers to the AES/EBU digital input
jack on the HD192 interface. This setting allows the
entire PCI-424 system (including other interfaces
connect to the PCI-424 card) to slave to another
AES/EBU device connected to the HD192 AES/
EBU digital input.
Use this setting whenever you are recording input
from a DAT deck or other AES/EBU device into the
HD192, and you are not using the HD192’s sample
rate conversion features.
HD192: Internal
24I/O: Internal
These settings produce the highest possible audio
performance (best signal to noise ratio, etc.) from a
PCI-424 system with one of these interfaces
connected. Use this setting when you want the
PCI-424 system to operate under its own digital
audio clock. For example, you may be in a situation
where all you are doing is playing tracks off hard
disk in your digital audio software on the
computer. In a situation like this, you most often
don’t need to reference an external clock of any
kind. For example, you might simply be playing the
hard disk tracks and mixing them to the main
outputs of your audio interface. In this case, no
other digital audio clocks are involved.