Apple Logic Pro 9 - Manual (Page 1189)

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 ) 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 ).
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.
1189 Chapter 40 Synchronizing Logic Pro