MOTU Digital Timepiece Instruction Manual download pdf (Page 124)

SYNCHRONIZATION WITH THE AV

122

drop). This ensures that the audio you record will

be recorded at the exact sample rate you have

chosen in the MIDI Timepiece AV LCD.

SLAVING ADATS

The MIDI Timepiece AV is programmed out of the

box to automatically establish synchronization

with an ADAT or chain of ADATs connected to its

ADAT Sync Out port. The MIDI Timepiece AV will

automatically set the ﬁrst ADAT it sees to

Device ID 1 and all subsequent chained ADATs to

device IDs 2, 3, and so on. For more information,

see “Connecting ADATs” on page 14 and “Setting

MMC device ID’s” on page 132.

Running ADATs at 44.1 kHz

To run an ADAT or ADAT XT at 44.1 kHz instead

of 48kHz, just set the desired sample rate on the

front panel of the MIDI Timepiece AV. Please note,

however, that when you choose 44.1 kHz, there will

be no indication on the ADAT front panel that it is

running at 44.1 kHz. Furthermore, the SMTPE

display on the ADAT front panel will not match the

SMPTE display in the MIDI Timepiece AV front-

panel LCD (or the rest of your MIDI Timepiece

AV-based system). This discrepancy, however, is

only a display issue: when you actually play music,

the music on the ADAT will be in perfect time with

the MIDI Timepiece AV (and everything else being

synchronized by the MIDI Timepiece AV). Please

contact Alesis for information about the

availability of a ROM update that addresses this

issue. Please note that this display discrepancy does

not occur when the ADAT or ADAT XT is running

at 48K.

Working with ADATs and the 2408

MOTU’s 2408 cross-platform audio interface for

provides a ﬁber-optic, 24-channel digital super-

highway between your ADATs and your 2408-

compatible audio software. The 2408 system

includes both word clock and ADAT SYNC ports

for clean, phased locked — and even sample-

accurate — digital audio transfers from ADATs to

the computer. For details, see the next section.

SLAVING A MOTU 2408 SYSTEM

The MIDI Timepiece AV provides complete

synchronization services for a MOTU 2408 (or

related) hard disk recording system. The AV can

continuously resolve the 2408 to video, SMPTE

time code or its own internal clock. This allows you

to slave the 2408 system to video, multi-track tape

decks, other hard disk recorders and any other

SMPTE time code source. If you have ADATs, the

AV provides ADAT sync to the 2408 and the

ADATs, allowing you to make sample-accurate

transfers between your ADATs and ASIO 2.0

compliant audio software.

ADAT Sync versus Word Clock

There are two ways to slave a MOTU 2408 system

to the MIDI Timepiece AV:

■ via ADAT Sync

■ via Word Clock

While there are several possible scenarios, we

recommend ADAT sync if you have an ADAT and

word clock otherwise.

!USB Interfaces Manual Book Page 122 Tuesday, October 10, 2000 12:43 PM

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