Apple Logic Express 7 - Manual (Page 460)

460 Chapter 18 Synchronization
Sync Problems and Solutions
Faulty Digital Synchronization
If Logic is synchronized to external wordclock (Audio Sync Mode: External/free), you
must ensure that a valid digital signal is always available. If you encounter error
messages such as “Sample Rate xxx kHz recognized” it may be that the DAT recorder (or
whatever clock source you have connected to your audio hardware’s digital input) does
not transmit wordclock in stop or pause mode (or has switched itself off ).
Faulty Synchronization to an External Tape Machine
Create a new song, make a new recording and see if that does the trick. Why? If an old
recording on tape was not properly synchronized to time code, you won’t be able to
use it. One basic rule: the playback situation must be identical to the recording
situation.
If everything is working fine with the new recording, this means the present setup is
okay. Next, check whether anything has changed in your global setup. Has the frame
rate changed? Has the tape speed changed? If you have changed a 30 fps setting, try
variations such as 30 drop or 29.97.
If MIDI and Audio Are Not Synchronized
Open the Synchronization > Audio page and select the MTC continuous or MTC Trigger/
ASD Audio Sync Mode.
If your audio hardware doesn’t support either mode, you should cut extremely long
Regions into shorter sections.
If MIDI and SMPTE Are Not Synchronized
Check all frame rate settings. The frame rate of all connected devices must be identical,
including the time code on the tape machine, the synchronizer, and in Logic itself.
Some synchronizers encode the wrong frame rate in MTC. In this situation, open the
Tempo Editor, switch off the Detect option, and set the correct frame rate manually.