MOTU 896HD User's Guide download pdf (Page 57)

DIGITAL PERFORMER

Occasionally, you may encounter a situation in

which you observe a slight offset of one sample —

or maybe a few — caused by inherent latencies in

the devices you are using with the 896HD. Usually,

these offsets will be consistent, and you can

compensate for them in Digital Performer. To do

so, choose MOTU Audio System Options>Fine-

tune Audio I/O Timing from the Setup menu

(Basics menu under Mac OS 9) as shown in

Figure 7-3.

Figure 7-3: Fine-tuning the timing of audio playback and recording.

SYNCHRONIZATION

Digital Performer can run under its own transport

control or slave to an external sync source, such as

SMPTE time code or ADAT sync (sample address).

Running DP under its own transport control

If you do not need to synchronize Digital

Performer with time code or another recording

device, such as a tape deck, just leave the Slave to

External Sync command in the Studio menu

(Basics menu under OS 9) unchecked.

However, even though Digital Performer is not

slaving to external sync, you still need to be

concerned with the synchronization of the

896HD’s digital audio clock with other devices

connected to it digitally (if any). For example, if

you have a digital mixer connected to the 896HD

via an ADAT optical lightpipe cable, you need to

make sure that their audio clocks are phase-locked.

For details, see “Syncing optical devices” on

page 25 and “Making sync connections” on

page 19. If you don’t have any digital audio devices

connected to the 896HD, digital audio phase-lock

does not apply to you.

Resolving DP and the 896HD to word clock,

video and/or SMPTE time code

To r e s o lve you r D i g i t a l Performer/896HD system

to word clock, video and/or SMPTE time code

using an additional synchronization device, use

the setup shown in “Syncing word clock devices”

on page 29 or “Syncing to video and/or SMPTE

time code” on page 24.

Choose Receive Sync from the Setup menu (Basics

menu under Mac OS 9) and choose the MTC

(MIDI Time Code) option. Then make sure that

the Slave to External Sync command in the Studio

menu (Basics menu under Mac OS 9) is checked.

To e n s u re t h at your audio tracks don’t drift out of

sync with your MIDI tracks — or time code, use a

hardware synchronizer like the MIDI Timepiece

AV o r D i g i t a l Timepiece to resolve the 896HD

hardware as well, as shown in Figure 3-23 on

page 29. A digital audio synchronizer is required

for drift-free SMPTE/MIDI time code sync. Make

sure the Clock Source setting in the MOTU

FireWire Audio Console window has the

appropriate setting for locking the 896HD to the

synchronizer. For example, in Figure 3-23 on

page 29, word clock is being used to resolve the

896HD, so the Clock Source setting is Wo rd Clock

In.

☛ If you have an ADAT sync compatible device,

don’t use SMPTE time code. Instead, use sample-

accurate sync as described in the next section.

Sample-accurate sync to ADAT and Tascam

To g e t h e r, D i g it a l Pe r former and the 896HD

provide you with sample-accurate transfers with

ADATs, Alesis recorders and any other devices that

support standard ADAT sample address (ADAT

Sync).

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