User Manual

65
CHAPTER
8 MIDI Machine Control
OVERVIEW
Your Express interface can serve as a MIDI Machine
Control (MMC) transport control “hub” for all MMC-
compatible devices, allowing you to manipulate the
transport controls of everything from one master set of
controls: either an MMC hardware controller device or
from MMC-compatible MIDI software on the computer.
How MMC works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Setting MMC device ID’s. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Setting up other MMC devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Preparing software for MMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Using software as an MMC controller . . . . . . . . . . . . . . . . . . . . . . . . 67
Using an MMC control surface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Using other devices as a controller . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
HOW MMC WORKS
An MMC controller (which has transport and cueing
controls) sends transport commands (play, stop, cue, etc.)
to an MMC device that is serving as a time code source.
When the MMC device responds to the transport
commands, it generates time code to which all other
devices (and software) chase and lock. The other devices
do not need to be MMC devices, as they sync in the usual
fashion via time code (LTC or MTC).
A recommended setup for MMC
The best scenario for MMC is to set the Master sync mode
of your Express interface to Internal. Your Express
interface serves as the time code source, and your
computer software (or hardware MMC controller) serves
as your MMC transport control master. The MMC
controller sends play, stop, start and locate commands to
your Express interface, and all other devices (including the
computer software) chase and lock to time code being
generated by your Express interface. In essence, your
Express interface serves as a time code “hub” for all other
devices as pictured in Figure 8-1 on page 68.
!USB Interfaces Manual Book Page 65 Tuesday, August 16, 2011 11:21 AM