MOTU 828mkII User's Guide download pdf (Page 62)

DIGITAL PERFORMER

(for reference and archiving purposes). Further, if

you are sending audio from Digital Performer to

the same output pair as MIX1, you can choose to

either include or exclude the audio from the

computer in the stream being sent back to Digital

Performer. For details on how to do this, see “Mix1

Return Includes Computer” on page 100.

☛ War n i ng: th e Mix 1 1-2 input can cause

feedback loops! DO NOT assign this input to a

track that shares the same 828mkII output pair as

MIX1.

24-BIT OPERATION

Yo ur 828mkII hardware fully supports Digital

Performer’s 24-bit recording capabilities, including

both analog and digital 24-bit recording. If you

would like to record and play back 24-bit audio

ﬁles, go to the Setup menu (Basics menu under OS

9), choose MOTU Audio System options>Conﬁgure

Sample Format, and choose 24-bit recording as the

sample format. This setting is saved with the

Digital Performer project.

FINE-TUNING I/O TIMING

The 828mkII has the ability to be sample accurate.

This means that when you transfer audio between

Digital Performer and an ADAT (or other ADAT-

sync compatible recorder), for example, you can

record the audio back and forth as many times as

you want between them and it will remain exactly

at its original sample location (unless you move it

in Digital Performer, of course).

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 828mkII.

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 8-3.

Figure 8-3: 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

828mkII’s digital audio clock with other devices

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

you have a digital mixer connected to the 828mkII

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 29 and “Making sync connections” on

page 22. If you don’t have any digital audio devices

connected to the 828mkII, digital audio phase-lock

does not apply to you.

Resolving DP and the 828mkII to SMPTE time

code

If you need to slave Digital Performer and the

828mkII to SMPTE time code, you can do so with

or without a dedicated synchronizer.

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