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MIDI Machine Control
MIDI Machine Control (MMC) is a protocol that controls an MMC-
equipped remote device via MIDI. Pro Audio lets you use MMC to start
and stop playback and recording on remote MIDI devices such as tape
decks, video recorders, and even other software packages. If you have
several MMC-controllable devices in your studio, assign each a unique
Unit ID so that MMC commands can be addressed to a particular device.
MMC is very powerful when used with MIDI Time Code sync. For
example, suppose you have an MMC-equipped digital tape deck that
generates time code and want to use the tape deck as the timing master
for a project. You can set up your equipment and software so that the
transport controls in Pro Audio send MMC messages to the tape deck,
which in turn starts and stops playback in Pro Audio via SMPTE/MTC
Sync. In this conÞguration, Pro AudioÕs transport buttons (Play, Record,
and Stop) are simply remote control substitutes for the buttons on your
tape deck. In this type of conÞguration, you must choose one MMC-
controllable device as the time code master.
When MMC is enabled, press Play to start playback on all connected
MMC devices, and press Stop to stop all connected devices. If you press
Record while playback is underway, all connected MMC devices (e.g.,
tape decks) begin recording on any armed tracks. If you stop recording
(without stopping playback), Pro Audio instruct the tape decks to punch
out. You must arm and disarm tracks on the tape deck; you cannot do
this from Pro Audio.
If you have established punch-in/out points using the Realtime-Record
Options command, Pro Audio will attempt to preprogram the punch-in
and punch-out times. However, your equipment must recognize the
MMC event command for this feature to work. (Consult the ownerÕs
manual or contact the equipment manufacturer for more information.) If
your equipment behaves erratically with automated punch-in, donÕt
attempt to use it when those pieces of equipment are connected.
Pro Audio instructs MMC devices to locate the current song position only
when playback or recording is started. This prevents excessive wear on
the motors and tape heads of the devices.
To Configure MIDI Machine Control…
1. Choose
Options-Project
, and click the Clock tab.
2. Select SMPTE/MTC as the clock source.
3. Click the MIDI Out tab.
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