Apple Logic Express 7 - Manual (Page 451)

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Synchronization
Logic can be synchronized with external hardware and
software via a number of different synchronization
protocols.
This chapter discusses the synchronization of Logic—as both synchronization master
and slave—in a number of different situations.
Functions
Switching on External Sync
Activation of the Transport Sync button synchronizes Logic to the chosen sync source.
You can use the Sync button to turn off external sync at any time, without changing
your selected sync source. This allows you to temporarily remove Logic from the sync
master’s time axis. This could prove useful if you need to quickly edit a MIDI Region
while the external sync source (tape machine, VTR, and so on) is still running, for
example.
Recording With External Synchronization
When Record is pressed during external synchronization, Logic enters record mode, but
does not start until it detects external time code.
Incoming MIDI Time Code Display
The flashing dot on the Transport window’s Sync button indicates that Logic is
receiving error-free MIDI time code.
If the dot “sticks”, an error has occurred. Although Logic is capable of dealing with many
MTC errors, you should nevertheless check the quality of your SMPTE signal, as well as
any other potential error sources.