MIDI
ls] Kinds
of
MIDI Data.
■
MI
DI
can
be
used to many kinds
of
messages that contain instructions and information to
be
used by the rece
iv
ing
synthesizer and/or rhythm machines.
Th
e main kinds
of
MIDI
da
ta are described below.
1 • CHANNEL VOICE MESSAGES
These tell the receiving synthesizer(s) whi
ch
sounds to
use, which notes to play. and when to
start
and stop
playing those notes. They may also include instructions
to use portamento, modulation, and other
eff
ects.
IJ NOTE
ON
EVENT
Th
is
tells the rece
iv
ing synth to start playing a note
(equivalent to depressing a key on the keyboard).
I]
NOTE
OFF
EVENT
This telils the receiving synth to stop playing a note
(equivalent
to
releasing the key
on
the keyboard).
B CONTROL CHANGES
This can
be
used to control pitch modulation, sustain
(damper
),
portamen
to
, and other effects.
liJ
PROGRAM CHANGES
Th
is
is
usecil
to select the sound program number to
be
used. Therefore, the receiving syn
th
(s)
can be
made to change its sound by remote contro
l.
0 CHANNEL PRESSURE (AFTER TOUCH)
This message indicates the operation
of
After Touch
(a function
to
add effects such as pitch modulation by
pressing harder after playing the key on the key-
boa
rd)
.
0 PITCH BENDER CHANGES
This is used
to
control pitch bend effect.
NOTE
ON
and NOTE OFF EVENT above
also
include
the
following
information.
NOTE NUMBER
Ev
ery note has a number (representing the key
on
a
keyboard). This number tells the receiving synth which
note
to
play.
Fig.
1
Note
number
in
pia110
ra
nge
~"
2S
7
"' "'
"
37
:t!I
•
....
..
>1
t_s1
" r,; "
61
63
....
10
73
75
"
..
82
., .,
90.,
..
97
.,
lO'l
104
100
1, n
•~~~-~~~~••
•
••~~~~~~•~ro~Ma>l7sa
nnN~nrn~~~••~o•»•oo~~••~ •
•••
VELOCITY
Th
is determines how loud the note is played. (Not all
synths
can
send
or
receive this data; however, no pro-
blems are created by mixing velocity and non-velocity
sensrtive keyboards.) The relationship
be
tween velocity
va
lue and ··volume" is shown in the chart here.
Fig
. 2
0 1
64
127
..._
__
Pf'P
__
,,,,
_ _ P
__
•_P
__
_
-.r
__
f _ _
ff
__
lif
_
_J
53
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