23—MIDI and Synchronization
302 www.RolandUS.com Roland VS-2400CD Owner’s Manual
5. Set SYNC MODE to EXT, for “External” so that the VS-2400CD uses the master
device’s timing to operate.
The SYNC with GAP parameter determines how the VS-2400CD responds to small
gaps, or “dropouts,” that often occur in time code for a variety of reasons. Set it to:
•
Off
—if you want the VS-2400CD to stop if there’s any gap in the time code.
•
On
—if you want the VS-2400CD to continue playing, or “freewheel,” at the last
synchronized speed until time code is again received.
6. Set EXT Sync SOURCE to the jack that’s receiving time code from the master
device. You can select MIDI IN or R-BUS.
7. Set FRAME RATE to the master device’s frame rate.
8. If you’ve turned on external sync in Step 5, set SYNC AUTO to:
•
Off
—so that the VS-2400CD uses its your FRAME RATE setting.
•
On
—so that the VS-2400CD automatically resets its frame rate to that of the
master device.
9. Set Sync ERROR LEVEL to adjust the VS-2400CD’s tolerance of dropouts in the
time code. Lower values make the VS-2400CD less tolerant of time code problems,
causing it to cancel synchronization by stopping the VS-2400CD’s hard disk
recorder. Higher values make the VS-2400CD more patient with problems in the
time code, giving it more time to recover before canceling synchronization.
10. Complete the setup by configuring the master device so that it’s set to:
• send MTC to the corresponding VS-2400CD jack.
• the same frame rate as the VS-2400CD.
• generate MMC.
• transmit SysEx data.
If you prefer, you can wait until you’re ready to start synchronized playback—hold
down SHIFT and press EXT SYNC to activate the VS-2400CD’s use of external sync.
If you’ve chosen to turn on external sync later in Step 5, set SYNC AUTO once external
sync has been activated—it can only be set once external sync has been turned on.
The best setting for the both the SYNC with GAP and Sync ERROR LEVEL parameters
is a personal judgement call. When SYNC with GAP is turned off and SYNC ERROR
LEVEL is set to a lower value, you can be sure that your sync is rock-solid when
synchronization is successful. On the other hand, it’s more likely that synchronization
will fail. If you turn SYNC with GAP on and use a higher Sync ERROR LEVEL value,
it’s more likely that synchronization will succeed, but it may not be as tight. You may
need to experiment with various settings to find the one that’s most satisfactory.
Consult the master device’s documentation for synchronization setup details.
If the time code produced by the master device starts before 00h00m00s00f00—that is,
it’s a negative value—the project playback on the VS-2400CD pauses at
23h.59m.59s.29f.99. Be sure not to record any audio in the project at this time location.
VS2400OMUS.book 302 ページ ２００６年２月２８日 火曜日 午前１１時１２分
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