Synchronization Using The Vs-1680 As The Slave; Using Mtc Offset - Roland VS-1680 User Manual

Sync MTC Type
This selects the MTC frame rate (30, 29N, 29D, 25,24).
Select the MTC rate that matches the rate used in your
MIDI sequencer.
8. Press [PLAY (DISPLAY)] to return to the Playlist display.
9. Set your MIDI sequencer to slave to the MIDI Time Code
messages received from the VS-1680, and set it to play
back MIDI song data. When playback begins on the VS-
1680, the MIDI sequencer begins playback as well.
Synchronization Using the
VS-1680 as the Slave
When you want to use the MIDI sequencer as the master to
control the VS-1680, use the following procedure:
1. Connect the VS-1680 and the MIDI sequencer as shown
in the following illustration.
fig.08-04
MIDI Sequencer
(implements MTC)
2. Hold [SHIFT] and press [EXT SYNC]. The Sync/Tempo
screen appears in the display.
fig.08-05
3. Use [
], [ ], [
cursor and use the TIME/VALUE dial to change the
settings.
Sync Error Level
This sets the time interval (0-10) after which the VS-1680
cancels synchronization in the absence of stable MTC
MIDI OUT
], and [ ] to move the
Chapter 15 Using External MIDI Devices
data—the VS-1680 continuously checks incoming MTC
and cancels synchronization if sync stops being received.
By setting a longer interval for this parameter, the
VS-1680 will be more tolerant of MTC errors, and
synchronization will continue until MTC re-stabilizes.
Sync MTC Type
This selects the MTC frame rate (30, 29N, 29D, 25,24).
Select the MTC rate that matches the rate used in your
MIDI sequencer.
4. Press [PLAY (DISPLAY)] to return to the Playlist display.
5. Set your MIDI sequencer to transmit MTC.
6. Press [EXT SYNC]. The button will begin blinking,
indicating the VS-1680 is set to synchronize using MTC
from the external MIDI sequencer.
7. Press [PLAY]. The button blinks green, indicating the VS-
1680 is in MTC receive-standby mode. When the MIDI
sequencer begins playback and begins transmitting
MTC, playback will begin on the VS-1680. During
synchronization, the EXT SYNC indicator and PLAY
indicator remain lit.
If MIDI Time Code is Unstable
When using MIDI sequencer software for personal
computers, depending on the hardware specifications
and the playing conditions, the MTC signal sent to the
VS-1680 may be unstable. If the synchronization is
erratic, try using the VS-1680 as the master device, or try
raising the VS-1680 Sync Error Level as described above.

Using MTC Offset

When the VS-1680 is running under the control of MTC from
an external MIDI device, you can synchronize the song's
playback time and the MTC time. The difference in these two
times is called the "offset." For example, if the MTC time is
01h00m00s00f00, and the song's time is 00h10m00s00f00, the
offset is as follows:
Offset = (MTC Time)-(song time)
Offset = 01h00m00s00f00-00h10m00s00f00
Offset = 00h50m00s00f00
If the offset value turns out to be a negative number, add
24h00m00s00f00 to the MTC time before subtracting the song
time. For example if the MTC time transmitted is
00h00m50s00f00, and you want the song to playback at
191