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About MIDI

This section explains the basic concepts of MIDI, and how the

VS-1824 handles MIDI messages.

What is MIDI

MIDI stands for Musical Instrument Digital Interface. It is a

worldwide standard that allows electronic musical

instruments and personal computer to exchange musical

performance data and messages such as sound selections.

Any MIDI-compatible device can transmit musical data (as

appropriate for the type of device) to any other MIDI-

compatible device, regardless of its manufacturer or model

type.

MIDI connectors

MIDI messages (the data handled by MIDI) are transmitted

and received using the following three types of connectors.

On the VS-1824, MIDI OUT and MIDI THRU are handled by

a single connector, which can be switched to act as the

desired connector. (Owner’s Manual p. 198)

MIDI IN: This receives MIDI messages from external

MIDI devices.

MIDI OUT: This transmits MIDI messages from the

VS-1824.

MIDI THRU: This re-transmits all MIDI messages that were

received at MIDI IN, without modifying them.

MIDI channels

MIDI is able to send information over a single MIDI cable

independently to two or more MIDI devices. This is made

possible by the concept of MIDI channels. You can think of

MIDI channels as being somewhat similar in function to the

channels on a television. By changing the channel of a TV set,

you can view a variety of programs being transmitted by

different broadcast stations. This is because data is received

only from the transmitter whose channel is selected on the

receiver.

In the same way, a MIDI device whose receive channel is set

to “1” will receive only the data being transmitted by another

MIDI device whose transmit channel is also set to “1.”

MIDI messages

The VS-1824 uses the following types of MIDI message.

Note messages:

These messages are used to play notes. On a keyboard, these

message transmit the key (note number) that was pressed,

and how strongly it was pressed (velocity). On the VS-1824,

these messages are used when you use a MIDI sound source

to play the metronome sound.

Program Change messages:

These messages are for the purpose of selecting sounds, and

contain a program number of 1–128. The VS-1824 uses these

messages to select scenes and effects. (Owner’s Manual p. 207)

Control Change messages:

In general, these messages are used to transmit information

such as vibrato, hold, and volume etc., that makes a

performance more expressive. The various functions are

differentiated by a controller number from 0–127, and the

controller number is defined for each function. The functions

that can be controlled on any given device will depend on

that device.

On the VS-1824, these messages are used in a completely

different way than on most instruments; they are used to

control mixer parameters.

Exclusive messages:

Unlike note messages and control change messages,

exclusive messages are used to transmit settings that are

unique to a particular device. On the VS-1824, exclusive

messages can be used to control mixer parameters (in the

same way as control change messages). Normally, control

change messages are easier to handle, so they should be used

rather than exclusive messages. Exclusive messages intended

for different units are distinguished by their Device ID,

rather than by MIDI channel. When exclusive messages are

to be transmitted or received, you must set the Device ID of

both units to a matching setting.

MIDI implementation chart

MIDI allows a variety of electronic musical instruments to

communicate with each other. However it is not necessarily

the case that all devices will be able to communicate using all

types of MIDI message. They can only communicate using

those types of MIDI message that they have in common.

Each owner’s manual for a MIDI device includes a MIDI

Implementation Chart. This chart shows you at a glance the

types of MIDI message that can be transmitted and received.

By comparing the implementation charts of two devices, you

will be able to see the types of message with which they will

be able to communicate.

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