10.6

Table Of Contents
1021Logic Pro User Guide
When Additional MIDI Options is selected in Advanced preferences, the following are
available:
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 record-enable commands for audio tracks” checkbox: Transmits MMC
record-enable and record-disable commands when audio tracks are record-enabled
or disabled. In addition, any received MMC record-enable commands set the record-
enabled state of audio tracks.
MIDI Inputs preferences in Logic Pro
Sometimes a hardware device using the same MIDI input port to communicate with both
Logic Pro and other software applications may send large streams of MIDI data, causing
playback artifacts or corrupted projects. For example, an audio interface may use a virtual
USB MIDI port to send a continuous stream of MIDI sysex data to both its mixer software
and to Logic Pro. If you are experiencing these issues when using Logic Pro with hardware
devices or other applications, MIDI Inputs preferences can be used to deactivate specific
MIDI input ports in use by other software applications.
To determine whether these issues are due to large MIDI data streams, and to determine
which MIDI input port the data is being transmitted on, you can use a MIDI monitoring
application (free MIDI monitoring applications are available on the Internet). You can also
refer to the documentation for your MIDI hardware device to see on which ports it sends
sysex data.