MOTU Digital Timepiece Instruction Manual Page 79

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CHAPTER
77
9 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 such as JL Coopers
CuePoint or from MMC-compatible MIDI
software on the computer.
How MMC works . . . . . . . . . . . . . . . . . . . . . . . . . .77
Setting MMC device ID’s . . . . . . . . . . . . . . . . . . . .78
Setting up other MMC devices. . . . . . . . . . . . . . .78
Setting up your computer software . . . . . . . . . . .78
Setting up a hardware MMC controller . . . . . . .78
Computer software as an MMC controller . . . .79
MMC remote control of record functions . . . . .79
Using a third-party MMC device as a master . .79
MMC routing example. . . . . . . . . . . . . . . . . . . . . .80
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 this scenario, your Express interface serves as a
time code “hub for all other devices as pictured in
Figure 4-4 on page 22.
Other MMC scenarios
In the recommended scenario described in the
previous section, your Express interface receives
MMC transport commands and serves as the time
code master for everything else.
Alternately, you could choose another MMC
device, such as a hard disk recorder, to receive
transport commands and serve as the time code
master. For example, the device would receive
transport commands from your computer
software and generate SMPTE time code (LTC). In
this case, you would set your Express interface
master sync mode to LTC QuikLock and feed the
LTC into your Express interface, which would then
drive all other devices.
There is no advantage to doing MMC this way; in
fact, it will probably not provide as stable a time
base as your Express interface does in the
recommended scenario described in the previous
section. You should only really use this setup if you
have a MMC device that does not have the ability to
be a time code slave and therefore must be the
master.
!USB Interfaces Manual Book Page 77 Tuesday, October 10, 2000 12:43 PM
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