Yamaha DJX - Manual (Page 93)

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MIDI is an acronym that stands for Musical Instrument Digital Interface, which allows electronic
musical instruments to communicate with each other, by sending and receiving compatible Note,
Control Change, Program Change and various other types of MIDI data, or messages.
The DJX can control a MIDI device by transmitting note related data and various types of controller
data. The DJX can be controlled by the incoming MIDI messages which automatically determine tone
generator mode, select MIDI channels, voices and effects, change parameter values and of course play
the voices specified for the various parts.
MIDI messages can be divided into two groups: Channel messages and System messages. Below is an
explanation of the various types of MIDI messages which the DJX can receive/transmit.
● Channel Messages
The DJX is an electronic instrument that can handle 16 channels. This is usually expressed as “it can
play 16 instruments at the same time.” Channel messages transmit information such as Note ON/OFF,
Program Change, for each of the 16 channels.
● System Messages
This is data that is used in common by the entire MIDI system. System messages include messages like
Exclusive Messages that transmit data unique to each instrument manufacturer and Realtime Mes-
sages that control the MIDI device.
The messages transmitted/received by the DJX are shown in the MIDI Implementation Chart on page
112.
Message Name DJX Operation/Panel Setting
Exclusive Message Reverb/chorus/DSP settings, etc.
Realtime Messages Clock setting
Start/stop operation
MIDI FUNCTIONS
Message Name DJX Operation/Panel Setting
Note ON/OFF Messages which are generated when the keyboard is played.
Each message includes a specific note number which corre-
sponds to the key which is pressed, plus a velocity value based
on how hard the key is stuck.
Program Change Voice number (along with corresponding bank select MSB/LSB
settings, if necessary).
Control Change Messages that are used to change some aspect of the sound
(modulation, volume, pan, etc.).
Voice number (with what voice) 156 (grand piano)
Note number (with which key) 60 (C3)
Note on (when was it pressed) and Timing expressed numerically (quarter note)
note off (when was it released)
Velocity (about how strong) 120 (strong)
Example of Keyboard Information