MOTU 896HD User's Guide download pdf (Page 40)

MOTU FIREWIRE AUDIO CONSOLE (MAC OS X)

information, which allows AudioDesk and Digital

Performer to transfer audio to and from ADAT-

sync compatible recorders without drifting by as

much as one sample.

Use this setting when you are using the 896HD

with one or more ADAT-sy nc compatible

recorders. Make sure the 896HD is connected to

the end of the ADAT sync chain.

Yo u s h o u l d also use this setting if you have a MIDI

Timepiece AV, which allows you to drive your

entire system from the transport controls of

AudioDesk, Digital Performer or other computer

software.

Yo u c o u l d also use ADAT sync to continuously

resolve the 896HD to SMPTE time code, video,

and word clock via a synchronizer like the MOTU

MIDI Timepiece AV. Word clock can accomplish

the same thing.

For further details, see “Sample-accurate ADAT

sync” on page 22, “Sample-accurate ADAT sync

with no synchronizer” on page 23 and “Syncing to

video and/or SMPTE time code” on page 24.

ADAT optical

The ADAT optical clock source setting refers to the

clock provided by the 896HD’s optical input, when

it is connected to an ADAT optical device. This

setting can be used to slave the 896HD directly to

the optical input connection. Most of the time, 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 896HD or an

external synchronizer such as the Digital

Timepiece. In this case, the ADAT Optical clock

source setting lets you slave the 896HD to the

device itself via its digital input to the 896HD.

If the ADAT Optical setting does not appear in the

Clock Source menu, it means that the 896HD’s

optical input is currently turned off. Choose the

ADAT optical format from the Optical input menu

(Figure 5-1 on page 38).

This setting is also useful if you just need to make a

simple, click-free digital transfer between the

896HD and another device — where a time code

reference and shared transport control are not

needed — without having to set up an elaborate

synchronization scenario.

For further details about this setting, see “Syncing

optical devices” on page 25.

Other audio interfaces

Yo u m ay s e e o t her audio interfaces in the Clock

Source list, such as another MOTU FireWire

interface, a MOTU PCI-324 or PCI-424 system, the

Macintosh built-in audio, or perhaps even another

third-party audio interface. The 896HD can

resolve to these other audio devices via their

CoreAudio driver. This allows you to play and

record audio with your host audio software via

both interfaces at the same time without their

audio streams drifting apart from one another over

long recording or playback passes. No external

synchronization connections are required for this

setting, as the two devices are entirely resolved via

the software driver.

Default Stereo Input/Output

In the System Preferences window, Mac OS X lets

you choose third-party hardware such as the

896HD 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.

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MOTU 896HD User's Guide Page 40

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