15-2
Synchronization Overview
Pro Audio supports several different types of synchronization, which rely
on a variety of different clock sources:
When you use either the internal or audio clock, Pro Audio can control
other MIDI devices using MIDI Sync. In this case, Pro Audio is the
ÒmasterÓ device and the other MIDI devices are the Òslaves.Ó
When MIDI Sync is the clock source, Pro Audio operates in response to
incoming MIDI messages. In this case, Pro Audio is the slave, and an
external MIDI device is the master. Note that audio playback is not
supported when using MIDI Sync with Pro Audio as the slave.
When SMPTE/MIDI Time Code (SMPTE/MTC) is the source of timing
information, Pro Audio operates in response to incoming MTC messages.
These messages could be generated by:
¥
An external MIDI device that is capable of generating MIDI Time
Code (like the Roland VS880)
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A MIDI interface that is converting other time code signals (like
SMPTE, EBU, or Þlm time code) into MIDI Time Code
When you use some of these synchronization options, some Pro Audio
commands work differently. This chapter describes each of the
synchronization options, how and why each is useful, and the effect each
option has on other features and commands.
The Sync toolbar lets you change back and forth quickly between the
different clock settings:
Clock source…
Timing is determined by…
Internal
The clock on the computer motherboard
Audio
The clock on the computer’s sound card
MIDI Sync
The clock on an external MIDI device
SMPTE/MIDI Time Code (MTC)
A time code signal (in SMPTE or some
other format) recorded on some external
medium
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