Sync settings in Logic Pro for Mac
The Sync pane contains the following settings:
When Enable Complete Features is selected in Advanced settings, the following are available:
All MIDI Output: Delay slider: Delays or advances the MIDI output for all ports, so you can compensate for any timing differences between MIDI tracks and audio or software instrument tracks.
MTC Pickup Delay slider: This should generally be set to zero, to ensure the quickest possible pickup time while Logic Pro is in MIDI Time Code (MTC) Sync mode. There are, however, some devices that 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 for Mac ignores the incoming MTC commands that occur in this time period. A (frame) value of 25 to 30 corresponds to a delay of about one second, depending on the frame rate. Use when synchronizing to hard disk recorders and other devices, if synchronization appears to be inconsistent.
Delay MTC Transmission By slider: Delays the transmission of MIDI timecode. Negative values result in MTC being transmitted earlier, allowing you to compensate for any reaction delays (to incoming MIDI timecode) in external devices that follow MTC from Logic Pro for Mac.
MMC Uses pop-up menu: Choose between MMC standard messages and the old Fostex format.
MMC Standard Messages: The MIDI MMC specification is strictly followed.
Old Fostex Format: The old Fostex format is used for MIDI Machine Control.
Output ID (Transport) checkbox: The All checkbox sends MMC to all ports. Use the field to the right to specify an output port ID.
Input ID (Transport) checkbox: The All checkbox sends MMC to all ports. Use the field to the right to specify an input port ID.
Transmit Locate Commands When: Pressing Stop twice checkbox: Transmits MMC Locate commands when the Stop button (or Stop key command) is used twice.
Transmit Locate Commands When: Dragging regions or events checkbox: Transmits MMC Locate commands with the position of a region that is dragged in the Tracks area when Logic Pro is stopped.
Transmit record-enable commands for audio tracks checkbox: Transmits MMC record-enable and record-disable commands when you turn record enable on or off on audio tracks. In addition, any received MMC record-enable commands set the record-enabled state of audio tracks.
MIDI Sync Project Settings button: Opens the MIDI Sync Project Settings pane.