Apple Logic Express 9 - Manual (Page 1143)

Logic Express can be synchronized with external hardware and software via a number of
different synchronization protocols. In this chapter, you’ll take a detailed look at these
protocols.
This chapter covers the following:
• Understanding the Synchronization Protocols (p. 1143)
• The Synchronization Master and Slave Relationship (p. 1144)
• Using External Synchronization (p. 1144)
• Displaying and Using SMPTE Positions (p. 1146)
• MIDI Machine Control (p. 1148)
• Synchronization Problems and Solutions (p. 1150)
Understanding the Synchronization Protocols
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 cannot 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 ).
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