User`s guide

Chapter 24: Time Code Synchronization 349
9 Close the Session Setup window. Con-
firm that your chosen parameters have
been received by the USD. If not, check
your connections and the settings in the
Session Setup Window.
10 Click the Online button on the Trans-
port, then click Play. Pro Tools generates
and outputs time code from the USD.
Syncing a Sequencer to
Pro Tools on the Macintosh
A common application for generating time
code with Pro Tools is slaving an OMS-
compatible sequencer to a Pro Tools ses-
sion.
Setting the Clock Master
The exact synchronization setup your se-
quencer requires will vary depending on
the software and your OMS setup, but
Pro Tools must be the clock master. Since
Pro Tools provides the audio sample clock
for your system, synchronization errors
will occur over time if Pro Tools is not des-
ignated as the master.
The following instructions describe the
general procedure, using Opcode’s Vision
software as an example and Pro Tools as
the master.
✽ You can also use Pro Tools MMC to synchro-
nize with an OMS/MMC-compatible sequencer
or an external MMC-compatible device such as
an ADAT or DA-88. See “Controlling External
Devices using MMC” on page 351.
To slave an OMS-compatible MIDI sequencer
to Pro Tools:
1 Make sure the OMS IAC Driver is in-
stalled in the OMS Folder inside your Sys-
tem Folder. If necessary, run the Pro Tools
Installer to install OMS with the OMS IAC
driver. (Refer to the Pro Tools Software
Installation Guide for details.)
In OMS Setup:
2 Choose Setups > Preferences, and make
sure the “Use Apple Serial DMA driver
when available” option is not selected.
Click OK.
▲ Always make sure the Apple Serial DMA
driver is not being used by OMS. It can prevent
proper communication with MIDI devices. You
must restart your computer any time you en-
able or disable the Apple Serial DMA driver.
3 Choose Setups > OMS MIDI Setup, and
select the “Run MIDI in background” op-
tion.
4 Choose Studio > MIDI Cards & Inter-
faces, click Update Setup, enable the appro-
priate ports, then click Search.
5 Confirm that the OMS IAC driver appears
in the OMS Studio Setup window. If it does,
save the document and make it your cur-
rent setup.