Apple Logic Pro X - Manual (Page 880)

Chapter 25 Preferences, project settings, and key commands 880
Unitor Synchronization settings
Unitor Synchronization settings are only available when Advanced Editing is selected in
Advanced preferences.
You can use these settings to edit the major synchronization parameters for the Unitor8
MIDI interface.
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SMPTE Mode buttons: You can instruct the Unitor8 to read or write SMPTE data.
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Read: Select to read SMPTE data.
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Generate: Select to write SMPTE data.
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SMPTE Mode Refresh checkbox: Activates Refresh mode, where fresh timecode is generated, in
sync with received timecode. Refresh mode works with both VITC and LTC (see below). You
should always use Refresh mode whenever you need to copy an LTC track, because you can’t
directly copy LTC without a considerable loss of quality. When copying entire multitrack tapes,
you should patch all tracks directly, but refresh the timecode track via the Unitor8.
Note: You should only use Refresh mode if you are copying timecode.
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SMPTE Type buttons: Define the SMPTE format that you want to use.
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LTC: Longitudinal (also called Linear) Time Code is written to a tape track.
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VITC: Vertical Interval (or Vertically Integrated) Time Code is written invisibly to a videotape.
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Off: No timecode is written.
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Freewheel slider: You can set the freewheel time (in frames) for LTC and VITC. The freewheel
parameter affects the SMPTE reader, and specifies how long the synchronizer continues
transferring MTC to the sequencer, after timecode ceases to be read.
Long freewheel times can maintain synchronization, even if there are dropouts in the
timecode, but they also increase the reaction time of Logic Pro after the timecode master
stops. In practice, you should set a value that is as large as necessary (for sustained operation),
and as small as possible (to reduce waiting times).