Chapter 15 Using External MIDI Devices

Using MTC Offset

3.

Use [

], [

], [

], and [

] to move the

When the VS-1824 is running under the control of MTC from

 

cursor to “Offset,” and use the TIME/VALUE dial to

 

change the setting.

 

 

an external MIDI device, you can synchronize the song’s

 

 

 

 

Offset

 

 

 

 

playback time and the MTC time. The difference in these two

 

 

 

 

 

 

When the VS-1824 is used as a slave to an external MIDI

times is called the “offset.” For example, if the MTC time is

 

 

device, you can synchronize the song’s playback time

01h00m00s00f00, and the song’s time is 00h10m00s00f00, the

 

 

and the MTC time. The offset settings range varies

offset is as follows:

 

 

depending on the MTC frame rate selected for the

 

 

 

Offset

= (MTC Time)-(song time)

 

current song.

 

 

 

 

Time Display Format

 

 

Offset

= 01h00m00s00f00-00h10m00s00f00

 

 

 

 

The time display can be set to either Relative (REL) or

Offset

= 00h50m00s00f00

 

 

Absolute (ABS). For this application, choose “ABS.”

 

 

 

If the offset value turns out to be a negative number, add

 

REL:

 

 

 

 

 

The starting time of the song is displayed as

24h00m00s00f00 to the MTC time before subtracting the song

 

 

00h00m00s00f00.

 

 

time. For example if the MTC time transmitted is

 

 

 

 

ABS:

 

 

 

 

00h00m50s00f00, and you want the song to playback at

 

 

 

 

 

 

The starting time of the song is based on the offset

00h01m00s00f00, then the offset works out as shown below:

 

 

time.

 

 

 

 

Offset

= (MTC Time)-(song time)

 

 

 

 

 

 

 

 

 

 

 

 

= 00h00m50s00f00-00h01m00s00f00

4.

Press [PLAY (DISPLAY)] to return to the Playlist display.

 

= (24h00m00s00f00 + 00h00m50s00f00)

 

 

 

 

 

 

 

- 00h01m00s00f00

Using the Sync Track (Master)

 

= 23h59m50s00f00

 

 

 

 

 

 

 

 

 

If your MIDI sequencer supports Song Position Pointer

 

 

messages, you can use MIDI Clock for synchronization.

If the VS-1824 is slaved to a MIDI device using a negative

There are two methods of synchronizing using MIDI Clock.

offset, song playback across 00h00m00s00f00 will

One is to use the sync track, and the other is to use the tempo

momentarily stop at 23h59m59s29f99 before resuming

map. The following material explains how to control the

playback. Be careful not to record any audio until after this

MIDI sequencer from the VS-1824 using the sync track.

point in time.

 

Tempo mapping is described in the next section.

Song

23h59m59s00

00h00m00s00f

Time

 

 

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)].

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 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.

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Roland VS-1824 owner manual Using MTC Offset, Using the Sync Track Master, What is the Sync Track?, 200