Apple Logic Pro X - Manual (Page 844)

Chapter 24 Video and synchronization 844
Synchronization problems and solutions
Due to the number of synchronization types available, and different implementations by various
manufacturers, you may experience timing issues when using Logic Pro X synchronously
with other devices or applications. This table describes common synchronization problems
and solutions.
Problem Solution
Digital synchronization error If Logic Pro X is synchronized to external word clock (Audio Sync
Mode: External or Free), make sure that a valid digital signal is always
available.
If you see a “Sample Rate xxx kHz recognized” error message, the clock
source device (DAT machine, for example) connected to your audio
hardware’s digital input may not transmit Word Clock in stop or pause
mode (or has switched itself off).
Poor or no synchronization to an
external tape machine Create a new project, then make a new recording in Logic Pro X of the
audio on tape.
If an old recording on tape was not properly synchronized to timecode,
you won’t be able to use it. When trying to synchronize to tape, there is
one key rule: the playback situation must be identical to the recording
situation.
MIDI and audio are not
synchronized Open the File > Project Settings > Synchronization > Audio tab and
choose MTC Continuous or MTC Trigger + Auto Speed Detection mode in
the Core Audio pop-up menu.
If your audio hardware doesn’t support either mode, you should cut
extremely long regions into shorter sections.
MIDI and SMPTE are not
synchronized Check all frame rate settings. The frame rates of all connected devices
must be identical, including the timecode on the tape machine, the
synchronizer, and Logic Pro X itself.
Some synchronizers encode the wrong frame rate in MTC. In this situation,
open the Tempo Editor, turn off the Detect option, and set the correct
frame rate manually.