Apple Logic Pro 8 - Manual (Page 831)

Chapter 36 Synchronizing Logic Pro 831
Using the Sync Button
You can use the Sync button to turn external synchronization on or off at any time,
without changing the selected synchronization source. This allows you to temporarily
disengage Logic Pro (running as a slave) from an external synchronization master
device. This could prove useful if you need to quickly edit a MIDI region while the
external synchronization source (tape machine, VTR, and so on) is still running, for
example.
When Logic Pro Is Running as a Slave
The Transport bar Sync button is lit/depressed, when active.
Click the upper (MIDI In) section of the MIDI Activity display—while receiving an
external synchronization signal—to view the frame rate of incoming MIDI time code.
Note: When you click the Record button during external synchronization, Logic Pro
enters record mode, but does not actually start recording until it detects an external
time code signal.
Accessing Synchronization Settings With the Sync Button
Control-click the Transport bar Sync button to open a shortcut menu, where the
following options are available:
 Setting the type of external synchronization.
 Determining whether or not MMC commands (see “
MIDI Machine Control ” on
page 844) should be transmitted by the Transport buttons of Logic Pro, allowing
remote control of MIDI-controlled tape machines.
 Direct access to the Synchronization settings.
 Direct access to the tempo editors (see “
Advanced Tempo Operations ” on page 641).
MTC Interpretation
As the MIDI standard only supports four of the six commonly used time code formats
(the 30 fps and 29.97 fps formats are not differentiated in the MIDI specification),
Logic Pro needs to decide which format is intended, when it encounters incoming time
code.
Incoming MTC (MIDI Time Code) is interpreted as follows:
 24 fps is interpreted as 24 fps.
 25 fps is interpreted as 25 fps.
 30 fps drop frame is interpreted as 29.97 drop fps.
 30 fps is interpreted as 29.97 fps.