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MIDI is an acronym that stands for Musical Instrument
Digital Interface, which allows electronic musical instru-
ments 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 CBX-K2 can control a MIDI device by transmitting
note related data and various types of controller data.
About MIDI
bank select will not function when a GM System On
message is received.

■ Control Change

Control Change messages let you control volume, panning,
modulation, portamento time, brightness and various other
controller parameters, through specific Control Change
numbers which correspond to each of the various param-
eters.
● Modulation (Control #001)
Messages which control vibrato depth using the Modu-
lation Wheel.
Setting the value to 127 produces maximum vibrato and
0 results in vibrato off.
● Portamento Time (Control #005)
Messages which control the duration of portamento, or a
continuous pitch glide between successively played
notes.
Setting the value to 127 produces maximum portamento
time and 0 results in minimum portamento time.
Portamento is turned on/off by Control #065.
● Data Entry MSB (Control #006)
● Data Entry LSB (Control #038)
Messages which set the value for the parameter speci-
fied by RPN or NRPN MSB/LSB. Parameter value is
determined by combining MSB and LSB.
● Main Volume (Control #007)
Messages which control the volume.
Setting the value to 127 produces maximum volume and
0 results in volume off.
● Pan (Control #010)
Messages which control the stereo panning position of
each voice (for stereo output).
Setting the value to 127 positions the sound to the far
right and 0 positions the sound to the far left.
● Expression (Control #011)
Messages which control intonation expression of each
voice during performance.
Setting the value to 127 produces maximum volume and
0 results in volume off.
● Sustain Switch (Control #064)
Messages which control sustain on/off.
Setting the value between 64 - 127 turns the sustain on,
between 0 - 63 turns the sustain off. On the CBX-K2, a
connected footswitch can be assigned to control sustain
when “SUS” is set.

CHANNEL MESSAGES

Channel messages are the data related to the performance
on the keyboard for the specific channel.

■ Note On/Note Off (Key On/Key Off)

Messages which are generated when the keyboard is played.
Transmission note range = C-2 (0) - G8 (127), C3 = 60
Velocity range = 1 - 127 (only Note On velocity is
transmitted)
Note On: Generated when a key is pressed.
Note Off: Generated when a key is released.
Each message includes a specific note number which
corresponds to the key which is pressed, plus a velocity
value based on how hard the key is struck.

■ Bank Select

● Bank Select MSB (Control #000)
● Bank Select LSB (Control #032)
Messages (MSB/LSB) which set the voice bank of a
tone generator.
When used on an XG-compatible tone generator set to
XG operation, normal or drum voice bank is selected by
the MSB value, and the particular voice bank is selected
by the LSB value. With Yamaha MU-series instruments,

MIDI Messages Transmitted by

the CBX-K2

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 CBX-K2 can
receive and transmit.
Depending on the particular device that you are using, some
messages may not be available. Refer to the owner’s
manual of the device for details.