10.6

Table Of Contents
991Logic Pro User Guide
Word Clock: A signal that is carried by all digital audio interface formats: ADAT, FireWire
Audio, S/P-DIF, AES/EBU, T-DIF, and others. Used to maintain the timing integrity of
sample words in audio signals that are transmitted digitally between Logic Pro and
external hardware or software. See Audio Synchronization settings in Logic Pro.
Tip: Logic Pro also supports manual or “human” sync, when receiving synchronization.
This is not a synchronization protocol per se, but enables Logic Pro to follow tempo
changes in real time. As an example, it could chase a live drummer. See Use the Logic Pro
Tempo Interpreter.
External synchronization in Logic Pro
When you first open Logic Pro, it is in Internal Sync (transmitter) mode. The control bar
Sync button, if visible, is not activated.
When Logic Pro is receiving synchronization, the control bar Sync button is activated.
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 stop Logic
Pro from receiving synchronization from an external device. This could prove useful,
for example, if you need to quickly edit a MIDI region while the external synchronization
source—tape machine, VTR, and so on—is still running.
You can use the Sync button shortcut menu to choose a synchronization source.
Note: The control bar Sync button is not displayed by default.
View the control bar Sync button
1. In Logic Pro, control-click the control bar, then choose Customize Control Bar from the
shortcut menu.
2. Select the Sync checkbox toward the bottom of the Modes and Functions column, then
click OK.
Synchronize Logic Pro
In Logic Pro, click the control bar Sync button to synchronize Logic Pro to the chosen
synchronization source.
Open synchronization settings with the Sync button shortcut menu
In Logic Pro, control-click the control bar Sync button to open a shortcut menu, then do
one of the following:
Set the type of external synchronization (a synchronization source). Choose from:
Internal Sync
SMPTE Sync (MTC)
Manual Sync (Tempo Interpreter)
Auto Sync In