Apple Logic Pro 7 User Manual download pdf (Page 611)

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Chapter 19 Synchronization 611

MTC Trigger

Audio regions are started in sync, but are then played at a constant sample rate,

regardless of any variations in the time code master signal. Logic always uses the set

nominal sample rate (44.1, 48, 88.2, 96, 192 kHz).

This mode is suitable when it is vital to retain the absolute pitch of a recording. If the

speed of the time code master deviates from the nominal value, you may need to split

long Regions into shorter sections.

External or Free

Logic has no influence on the sample rate. The audio hardware is responsible for

ensuring that the position and sample rate of audio Regions match. This mode is only

advisable if you are sure that the word clock and time code master are running in

sync—by using an external SMPTE/wordclock synchronizer, for example.

Digital

Similar to External or Free, but the hardware is also set up to synchronize to the sample

rate of the incoming digital signal.

SSD/VSD Type

Exactly the same as Digital, but a SMPTE Slave Driver (SSD) or Video Slave Driver (VSD)

is used in addition—to synchronize with the sample and frame rates used in Logic. The

SMPTE slave driver is a device for synchronizing ProTools hardware to time code or

word clock.

MIDI

Transmit MIDI Clock

The checkboxes activate transmission of MIDI Clock. The pull-down menus determine

the MIDI output ports for the MIDI Clock signal.

The two Destinations allow you to specify discrete MIDI ports.

Every time you start, “Song Position Pointer” (SPP) is also sent.

As not all devices can process SPP, the MIDI system realtime “Continue” message is also

sent. The exception to this is when you start at position 1 1 1 1. In this situation, the

realtime “Start” message is sent.

MIDI Clock can easily be sent with other normal MIDI events (notes, controllers). When

using multiport 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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Apple Logic Pro 7 User Manual Page 611

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