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Chapter 16 Using Software Sequencers
Synchronizing the VS-1824 with a MIDI sequencer allows
you to add MIDI instruments without actually recording
them to tracks on the VS-1824. Because the VS-1824 includes
a 28-channel digital mixer, you can mix and process up to 10
live signals from a MIDI-based sequencing system along
with the recorded tracks in the VS-1824. This can reserve the
VS-1824's tracks for recording vocals, guitar, etc.
This chapter explains how to synchronize the VS-1824 with
some common software sequencing programs. If you are
using a version of one of the following programs other than
the one described in this chapter, it is likely the steps here
will still apply—see the sequencer's manual if the menus and
settings you find are different from those in this chapter.
Common Terms
MIDI Clock
Used for synchronizing two or more MIDI devices. MIDI
Clock (sometimes called MIDI Beat Clock) sends timing
information based on the number of beats per minute (e.g.
120bpm). MIDI Clock is available on almost all sequencers
and drum machines and is usually used in conjunction with
Song Position Pointer (see below).
MIDI Time Code (MTC)
Another method of synchronizing two or more MIDI
devices. Unlike MIDI Clock, MTC uses time-based
information (Hours, Minutes, Seconds, Frames) to
synchronize devices and does not reference a specific tempo
or time signature. Because MTC uses a more complicated
signal, it is not implemented on some devices. When
available, MTC is usually more desirable for synchronizing
audio recorders and tape decks. MTC is sometimes used in
conjunction with MIDI Machine Control (see below).
MIDI Machine Control (MMC)
Transport and locate commands (Play, Stop, Record, etc.)
that are transmitted through MIDI. MMC is used to control a
device (e.g. the VS-1824) remotely. Another protocol (usually
MTC) is used to provide the sync signal.
Song Position Pointer (SPP)
This MIDI message allows you to locate to any point within a
song (e.g., bar 33, beat 4). SPP is normally used with MIDI
Clock. It does not work with MTC.
Synchronization
When using a sequencer or a drum machine with the VS-
1824, it is often desirable for the two devices to start and stop
at the same time. This is referred to as "synchronization."
Typically, you have a "master" device and a "slave" device.
When the master device is started, the slave device will start
at the same time. MIDI devices primarily use either of two
methods for synchronization: MIDI Clock (often used with
Song Position Pointer) or MIDI Time Code (sometimes used
with MIDI Machine Control).
Sequencer Tracks
Tracks on the VS-1824 are similar to tracks on a sequencer.
Just as you can record an instrument (or multiple
instruments) on a track of the VS-1824, you can record MIDI
information on a sequencer track.
MIDI Interface
A MIDI Interface is used to connect MIDI devices to your
computer. There are various types of MIDI interfaces
available to choose from. The setup procedure for your MIDI
interface will vary depending on the type of interface and
computer you are using. On the Macintosh, MIDI interfaces
are usually connected to the printer, modem, or USB port(s).
The interface is then controlled by the sequencing software
itself or by one of three programs: Apple MIDI Manager,
OMS (Opcode), or FreeMIDI (Mark of the Unicorn). On
Windows-based computers, MIDI interfaces are usually
connected to the serial port, parallel port, USB port, or
directly to a sound card. Each interface will likely have its
own software drivers that must be installed and configured
for the interface to operate correctly.
MIDI Interface Troubleshooting Tips
If you are having trouble getting your MIDI interface to work
properly, there are a number of troubleshooting techniques
you can use to determine where the problem lies. On the
Macintosh, most setup problems are the result of conflicting
extensions in the System Folder. Try disabling any extensions
that are not absolutely necessary for the program to run, and
restart your computer. On Windows-based computers, most
setup problems are the result of conflicting IRQ and/or Port
Address settings. Make sure that each of the devices
connected to your computer is set to its own IRQ and Port
Address and that the corresponding software driver(s)
reflects those settings. Defective or incorrectly connected
MIDI cables are another common problem encountered
when configuring a MIDI sequencing setup.
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