Apple Logic Pro 8 - Manual (Page 964)

964 Chapter 40 Project Settings and Preferences
Sync Preferences
 All MIDI Output Delay field: Delays or advances the MIDI output for all ports, allowing
you to compensate for any timing differences between MIDI tracks and audio or
(software) instrument tracks.
 MIDI Clock: Allow Song Position Pointer while playing: Song Position Pointer data is not
normally sent while the sequencer is in play mode (this is in accordance with the
MIDI Standard). This option allows Logic Pro to send SPP while the sequencer is
running. The advantage is that external devices can also follow Logic Pro in Cycle
mode. If your external devices cannot process SPP, you should switch this option off.
If your devices can follow MTC (MIDI Time Code), you should leave this option
unchecked, and use the MTC functions of Logic Pro.
 MTC Pickup Delay: This parameter should generally be set to zero, to ensure the
quickest possible pickup time while Logic Pro is in MTC (MIDI Time Code) sync mode.
There are, however, some devices which seem to transmit imprecise MTC commands
when first started. As a result, synchronization may be unreliable, and there could be
an offset every time synchronization is established. In such situations, you can set a
delay time before incoming MTC is picked up. Essentially, Logic Pro will ignore the
incoming MTC commands that occur in this time period. A (frame) value of 25 to 30
corresponds to a delay of about a second, depending on the frame rate. Use this
parameter when synchronized to hard disk recorders and other devices, if
synchronization doesn’t appear to be consistent.
 Delay MTC Transmission by: This parameter allows you to delay the transmission of
MIDI time code. Negative values result in MTC being transmitted earlier. This facility
enables you to compensate for any reaction delays (to incoming MIDI time code) in
external MTC slave devices.
 MMC Uses: This menu allows you to choose between the following settings: