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Connecting an External MIDI Device

MIDI (Musical Instrument Digital Interface) is a standard specification that
allows musical data to be transferred between electronic musical
instruments and computers. If a MIDI cable is connected between devices
equipped with MIDI connectors, you’ll be able to play multiple devices
from a single MIDI keyboard, perform ensembles using multiple MIDI
instruments, program the settings to change automatically as the song
progresses, and more.
The JUNO-Di is equipped with the following two types of MIDI
connectors, each of which has the following role.

fig.midiconnector

MIDI IN Connector

This connector receives MIDI messages that are sent from an external
MIDI device. When the JUNO-Di receives MIDI messages, it can respond
by playing notes, switching sounds, etc.

MIDI OUT Connector

This connector transmits MIDI messages to an external MIDI device. Use it
when you want to control an external MIDI device.
MIDI is able to transmit multiple streams of performance data over a
single MIDI cable. This is made possible thanks to the concept of MIDI
channels. MIDI channels allow a receiving device to pay attention only to
the messages that are intended for it, and not to messages intended for
another device. In some ways, MIDI channels are similar to television
channels. By changing the reception channel of a television set, you can
view the programs that are being broadcast by different stations. This is
because the television set is choosing only the desired data from the
variety of data that is being broadcast. In the same way, MIDI also allows
a device to distinguish and use only the incoming data that is being
transmitted to it.

fig.MidiCh1-j.eps

There are sixteen MIDI channels: 1-16. Normally, you’ll set the receiving
device to receive only the channels that it needs to receive.

Example:

Set the transmitting device to transmit on channel 1 and channel 2, set
sound module A to receive only channel 1, and set sound module B to
receive only channel 2. With this setup, you could create an ensemble in
which sound module A is playing a guitar sound while sound module B is
playing a bass sound.

fig.MidiCh2-j.eps

You’ll be able to use up to sixteen channels when using the JUNO-Di as a
sound module. Sound modules that can receive multiple channels of
data simultaneously and play different sounds on each channel are called
multitimbral sound modules.

About MIDI

About MIDI Connectors

MIDI Channels and Multitimbral

Sound Generators

The cable from the antenna carries the TV
signals from many broadcast stations.
The TV is set to the channel of the station
you wish to watch.
Station B
Station A
Station C
MIDI OUT MIDI IN MIDI THRU
MIDI IN
Receive channel: 1
Receive channel: 2
Sound
Module
A
Sound
Module
B
Transmit channel: 1, 2
MIDI keyboard
GM
GM (General MIDI) is a set of recommendations that allows the MIDI
capabilities of sound modules to be standardized across
manufacturers. Sound modules or music data that meet the GM
standard carry the GM logo ( ). Music data with the GM logo
can be played back on any sound module carrying the GM logo, and
will produce essentially the same musical performance.
GM2
GM2 ( ) is a set of recommendations that is upwardly
compatible with the original GM recommendations, and allows a
higher level of musical expression and compatibility. It covers issues
that were not covered by the original GM recommendations, such
as ways in which sounds can be edited and how effects should be
handled. It also expands the sounds that are available.
Sound modules that are compatible with GM2 will correctly play
back music data that carries either the GM or GM2 logo. The original
GM, which does not include the GM2 enhancements, is sometimes
called “GM1” in order to distinguish it from the newer set of
recommendations.
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