User guide

856 Chapter 35 Synchronizing Logic Express
Transmit MTC (MIDI Time Code)
The checkbox activates transmission of MIDI time code. The menu determines the MIDI
output port for the MTC signal.
If you can avoid it, you shouldn’t send MTC to all ports, as it is very data-intensive. If
possible, use a MIDI port that isn’t being used for anything else.
Transmit MMC (MIDI Machine Control)
Turn on this checkbox to enable transmission of MIDI Machine Control (see “MIDI
Machine Control” on page 861). These commands are then sent whenever you operate
the transport functions (Start, Stop, Rewind, and so on) of Logic Express.
MMC is normally used when Logic Express is running as a slave to an external master
(such as an ADAT), and you want to control the external master’s transport functions
from Logic Express. Logic Express therefore acts as MMC master, and MTC slave
simultaneously.
If you want to use the external master’s transport controls, you don’t need to use MMC.
In this situation, Logic Express will follow the MTC master as a slave.
You can also use MMC to place tracks on the MMC slave device into record-enabled
mode.
Listen to MMC Input
If this checkbox is activated, Logic Express can be controlled by MMC (MIDI Machine
Control) and so-called Full Frame Messages.
Logic Express recognizes these commands when listening to MMC Input:
 Play
 Deferred Play
 Stop
Deferred Play is a special command for mechanically slow synchronization slaves such
as reel-based tape recorders. Rather than having the machine play immediately, it is
asked to reach the desired SMPTE position before playback is started. You’ll find no
difference in Logic Express’s response to the Play and Deferred Play commands, as
Logic Express can locate to any position almost instantly.
Logic Express ignores these messages when incoming external MTC (MIDI Time Code)
commands are detected.
Logic Express 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.