User guide

Chapter 35 Synchronizing Logic Express 855
MIDI
The MIDI tab of the Synchronization project settings configures Logic Express to send
time code via MIDI, when running (record or play mode). This enables you to
synchronize external devices as slaves to Logic Express, which acts as the master.
Transmit MIDI Clock
The checkboxes activate transmission of MIDI Clock. The two Destination menus allow
you to determine two discrete MIDI output ports for the MIDI Clock signal.
Every time you start, a Song Position Pointer (SPP) message is also sent. As not all
devices can process SPP, the MIDI system real time Continue message is also sent. The
exception to this 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, controllers). 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.
Delay Transmission By
This parameter allows you to delay the transmission of MIDI Clock signals. Negative
values mean that the MIDI Clock signal is transmitted earlier. This enables you to
compensate for any reaction delays in external MIDI Clock slaves.