Apple Logic Pro X - Manual (Page 863)

Chapter 25 Preferences, project settings, and key commands 863
Sync preferences
The Sync pane contains the following preferences:
When Show Advanced Tools is selected in Advanced preferences, the following are available:
•
All MIDI Output: Delay field: Delays or advances the MIDI output for all ports, so you can
compensate for any timing differences between MIDI tracks and audio or software
instrument tracks.
•
MIDI Clock: “Allow to send Song Position Pointer while playing” checkbox: Song Position Pointer
(SPP) data is not normally sent while the sequencer is in playback mode. (This is in accordance
with the MIDI Standard.) If selected, this option allows Logic Pro to send SPP data while the
sequencer is running. The advantage is that external devices can also follow Logic Pro in Cycle
mode. If your external devices cannot process SPP, you should deselect this option. If your
devices can follow MTC (MIDI Time Code), you should leave this option unselected (default),
and use the MTC functions of Logic Pro.
•
MTC Pickup Delay field: This should generally be set to zero, to ensure the quickest possible
pickup time while Logic Pro is in MTC (MIDI Time Code) Sync mode. There are, however,
some devices that seem to transmit imprecise MTC commands when first started. As a result,
synchronization may be unreliable, and there could be an offset every time synchronization
is established. In such situations, you can set a delay time before incoming MTC is picked up.
Essentially, Logic Pro will ignore the incoming MTC commands that occur in this time period. A
(frame) value of 25 to 30 corresponds to a delay of about one second, depending on the frame
rate. Use when synchronizing to hard disk recorders and other devices, if synchronization
doesn’t appear to be consistent.
•
Delay MTC transmission by field: Delays the transmission of MIDI timecode. Negative values
result in MTC being transmitted earlier, allowing you to compensate for any reaction delays (to
incoming MIDI timecode) in external MTC slave devices.
•
Transmit locate commands when: “Pressing Stop twice” checkbox: Allows transmission of MMC
Locate commands when the Stop command is pressed twice (using the Stop button in the
control bar, or using the Stop key command).
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Transmit locate commands when: “Dragging regions or events” checkbox: If this option is selected
and Logic Pro is stopped (not in playback or record mode), MMC Locate commands are sent
with the position of a region that is dragged in the Tracks area.