Apple Logic Pro X - Manual (Page 878)

Chapter 25 Preferences, project settings, and key commands 878
MIDI Synchronization settings
MIDI Synchronization settings are only available when Show Advanced Tools is selected in
Advanced preferences.
You can use these settings to synchronize external slave devices to Logic Pro, which acts as
the master.
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Transmit MIDI Clock: Destination 1 checkbox: Activates MIDI Clock transmission.
Every time you start playback, a Song Position Pointer (SPP) message is also sent. Because
not all devices can process SPP, the MIDI system real-time Continue message is also sent. The
exception is when you start at position 1 1 1 1. In this situation, the real-time Start message
is sent.
MIDI Clock can easily be sent with other normal MIDI events (notes and controllers, for
example). When using multi-port MIDI interfaces (such as the Unitor8), better timing is
achieved by sending MIDI Clock to All ports, rather than to several individual ports.
If MIDI Clock is transmitted to all ports, the events are only sent once from the computer to
the interface. If you address individual ports, one event needs to be sent for each port, placing
a higher strain on the bandwidth of all ports.
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Transmit MIDI Clock: Destination 1 pop-up menu: Determines the first discrete MIDI output port
for the MIDI Clock signal.
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Transmit MIDI Clock: Destination 2 checkbox: Activates MIDI Clock transmission.
•
Transmit MIDI Clock: Destination 2 pop-up menu: Determines the second discrete MIDI output
port for the MIDI Clock signal.
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“Delay transmission by” slider: Use to delay the transmission of MIDI Clock signals. Negative
values mean that the MIDI Clock signal is transmitted earlier. This allows you to compensate
for any reaction delays in external MIDI Clock slaves.
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Transmit MTC checkbox: Activates the transmission of MIDI timecode.
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Transmit MTC pop-up menu: Determines the MIDI output port for the MTC signal.
Note: If you can avoid it, you shouldn’t send MTC to all ports, as it’s very data intensive. If
possible, use a MIDI port that isn’t being used for anything else.