User guide

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35 Synchronizing Logic Express
Logic Express can be synchronized with external hardware
and software via a number of different synchronization
protocols.
This chapter discusses the use of Logic Express—as both synchronization master and
slave—in a number of different situations.
Logic Express supports the following synchronization protocols:
 MIDI Time Code (MTC): Translation of a SMPTE time code signal into a MIDI standard
time code signal.
 MIDI Clock: Short MIDI message for clock signals. It is used to provide a timing pulse
between MIDI devices. Logic Express can send MIDI Clock signals to synchronize
external devices. It can not receive MIDI Clock synchronization signals.
 SMPTE time code: An audio signal that is translated into MTC by some MIDI interfaces,
such as the Unitor8.
 Word Clock: This is a signal that is carried by all digital audio interface formats (ADAT,
FireWire Audio, S/P-DIF, AES-EBU, T-DIF). It is used to maintain the timing integrity of
sample words in audio signals that are transmitted digitally between Logic Express
and external hardware or software.
 ReWire: Logic Express can act as a ReWire host. It acts as the master synchronization
source for ReWire-enabled applications such as Reason and Ableton Live. This
chapter does not cover the use of Logic Express as a ReWire host (see “Working With
ReWire Applications” on page 260 for more information).
∏ Tip: Logic Express also supports manual or “human” sync, when slaved. This is not a
synchronization protocol per-se, but enables Logic Express to follow tempo changes in
real time. As an example, it could chase a live drummer. See “Using the Tempo
Interpreter” on page 679 for more information.