10.6

Table Of Contents
1043Logic Pro User Guide
Clock Start: “at position” field: Defines the musical position at which the MIDI Clock
output should start. 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.
Clock Start: “with a pattern length of ____ Bar(s)” field: When Clock Mode is set to
“Pattern - Quantized clock start based on pattern length” use this field to select the
length of the pattern in bars.
Transmit MIDI Machine Control (MMC) checkbox: Activates transmission of MIDI
Machine Control to all MIDI output destinations with MMC selected.
Listen to MMC Input checkbox: Controls Logic Pro by MIDI Machine Control and so-
called Full Frame Messages.
Logic Pro recognizes these commands when listening to MMC Input:
Play
Deferred Play
Stop
Deferred Play is a special command for devices receiving MIDI clock that are
mechanically slow, such as reel-based tape recorders. Rather than having the machine
play immediately, its asked to reach the desired SMPTE position before playback is
started. There’s no noticeable difference in the response of Logic Pro to the Play and
Deferred Play commands, because Logic Pro can start playback at any position almost
instantly.
Logic Pro ignores these messages when incoming external MTC (MIDI Time Code)
commands are detected.
Logic Pro also obeys Full Frame Messages, and sets the playhead to a new location,
without starting playback. Once again, incoming MTC data has higher priority, if
conflicting information is received.
Some synchronizers send Full Frame Messages (instead of MTC) to locate the device
receiving MIDI clock (Logic Pro in this case) to a new position, without implicitly starting
playback. This is useful when in Slow Shuttle or Single Frame Advance mode with video
machines, because the device receiving MIDI clock is perfectly located, without being in
playback mode.
Save as Default button: Saves the current MIDI synchronization settings and applies
them to all new projects.
MIDI Sync Preferences button: Opens the Sync tab of the MIDI Preferences window.