User`s guide

Pro Tools Reference Guide356
MMC and OMS Synchronization
When using MIDI Machine Control, you
must have the OMS-compatible sequencer
configured to synchronize to Pro Tools us-
ing the OMS IAC Driver (see “Syncing a Se-
quencer to Pro Tools on the Macintosh” on
page 349). When controlled by a sequencer
via MMC, Pro Tools serves as clock master
for the sequencer.
Pro Tools also serves as a transport and lo-
cation slave to the sequencer. When start-
ing and stopping playback in the se-
quencer, the sequencer sends out location
information to Pro Tools via MMC com-
mands. Pro Tools then cues to the location,
begins playback, and sends MIDI Time
Code back to the sequencer. The sequencer
then locks to the MIDI Time Code from
Pro Tools for synchronized playback.
The following instructions describe the
general steps that you should take, using
Opcode’s Vision software as an example
and Pro Tools as transport and cueing
slave. The exact synchronization setup
your sequencer requires will vary depend-
ing on the software and your specific OMS
setup.
To slave the Pro Tools transport to an OMS-
compatible MIDI sequencer using MIDI
Machine Control:
1 Make sure the OMS IAC Driver is in-
stalled in the OMS Folder inside your Sys-
tem Folder. If necessary, run the OMS
Installer and choose Custom Install to in-
stall the OMS IAC driver.
2 In Pro Tools, choose Setups > OMS Studio
Setup to launch the OMS Setup applica-
tion.
In OMS Setup:
3 Choose Setups > Preferences, make sure
the “Use Serial DMA driver when available”
option is deselected, and click OK.
4 Choose Setups > OMS MIDI Setup, make
sure the “Run MIDI in background” option
is selected, and click OK.
5 Choose Setup > MIDI Cards and Inter-
faces, and click Update Setup.
6 Select the port that the MIDI interface is
connected to, then click Search.
7 Confirm that the OMS IAC driver appears
in the OMS Studio Setup window. Save the
setup document and make it your current
setup.
8 In the OMS Studio Setup window, define
two IAC busses by double-clicking the IAC
Driver, then naming the first field “IAC1”
and the second field “MMC.”
In Vision:
9 Choose Setups > Enable Input Devices,
and select the IAC bus (“IAC1”).
10 Choose Options > Sync Options