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Chapter 15 Using External MIDI Devices
Using MTC Offset
When the VS-1824 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
00h01m00s00f00, then the offset works out as shown below:
Offset
= (MTC Time)-(song time)
= 00h00m50s00f00-00h01m00s00f00
= (24h00m00s00f00 + 00h00m50s00f00)
- 00h01m00s00f00
= 23h59m50s00f00
If the VS-1824 is slaved to a MIDI device using a negative
offset, song playback across 00h00m00s00f00 will
momentarily stop at 23h59m59s29f99 before resuming
playback. Be careful not to record any audio until after this
point in time.
fig.08-05a
Song
00h00m00s00f
23h59m59s00
1. Hold [SHIFT] and press [F5 (SYSTEM)]. The System
menu icon appears in the display. If the System menu
icon does not appear, press [F6 (EXIT)].
2. Press [F1 (SYSPM)]. If "SYSPM" does not appear in the
display above [F1], press [PAGE] until "SYSPM"
appears, and then press [F1 (SYSPM)].
200
3. Use [
4. Press [PLAY (DISPLAY)] to return to the Playlist display.
Using the Sync Track (Master)
If your MIDI sequencer supports Song Position Pointer
messages, you can use MIDI Clock for synchronization.
There are two methods of synchronizing using MIDI Clock.
One is to use the sync track, and the other is to use the tempo
map. The following material explains how to control the
MIDI sequencer from the VS-1824 using the sync track.
Tempo mapping is described in the next section.
What is the Sync Track?
In addition to the tracks for recording audio signals, the VS-
1824 has a separate track for recording MIDI Clock signals.
This is called the "sync track." Unlike conventional
multitrack tape recorders, it is not necessary to reserve one of
Time
the audio tracks for recording the sync track.
To use the sync track, simply record the MIDI Clock
messages from your sequencer onto the sync track. Then put
your sequencer in external sync mode and transmit the sync
track data from the VS-1824 back to your sequencer.
The sync track can be very convenient if you have already
created a tempo map in your sequencer and you want the
measure/beat display on the VS-1824 to match that of your
sequencer. Many sequencers also provide more precise
control over things such as tempo and meter changes than is
possible from the tempo map editing parameters within the
VS-1824.
], [
], [
], and [
cursor to "Offset," and use the TIME/VALUE dial to
change the setting.
Offset
When the VS-1824 is used as a slave to an external MIDI
device, you can synchronize the song's playback time
and the MTC time. The offset settings range varies
depending on the MTC frame rate selected for the
current song.
Time Display Format
The time display can be set to either Relative (REL) or
Absolute (ABS). For this application, choose "ABS."
REL:
The starting time of the song is displayed as
00h00m00s00f00.
ABS:
The starting time of the song is based on the offset
time.
] to move the
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