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What is MIDI?
MIDI stands for Musical Instrument Digital
Interface, a sophisticated system that allows
various electronic musical instruments and other
devices to "communicate" with each other. This
is done by sending and receiving MIDI
messages over a MIDI cable.
Since MIDI has such as a broad scope and so
many different uses, it would be impossible to
explain everything here. However, if you're a
MIDI "novice," the brief explanations below
will give you a good start in understanding this
powerful and flexible technology.
MIDI Messages
The MU15 is controlled by various types of
MIDI messages. Using them in song data on a
sequencer or from a MIDI keyboard, you can:
• Determine the Sound Module mode
• Select MIDI channels, Voices and effects
• Play the Voices
• Edit the Parts and change parameter values
• Edit the effects
Note On/Off (Key On/Off)
These tell the MU15 which notes to play and
how long they are to be played. Velocity values
let you change the dynamics or level of the
sound, depending on how strongly you play the
keys.
Program Change
These messages determine which Voice is
selected for each Part, and they can be inserted
at any desired location in the song. Used with
Bank Select messages, they let you access any
of the 676 Voices of the MU15.
Control Change
These messages provide powerful, real-time
control over various aspects of the sound —
including volume, pan position, sustain,
Decimal - Hexadecimal
Conversion Chart
Many MIDI messages listed in the
MIDI Data Format section, are
expressed in hexadecimal numbers.
The chart at right lists the
corresponding decimal number for
each hexadecimal number.
(Hexadecimal numbers may include
the letter "H" as a suffix.)
MIDI Data Format
modulation, brightness, portamento time, effect
depth, and many others. Depending on the
controllers available on your particular MIDI
instrument and their Control Change number
assignments, you can use key velocity,
aftertouch (see below) foot controllers, pedals,
sliders, performance wheels, and joysticks to
control these aspects of the sound.
These messages let you continuously raise or
lower the pitch of the Voices as you play. They
are usually controlled with a pitch bend wheel
on a MIDI keyboard.
This is a pressure sensing function that lets you
control an assigned aspect of the sound by the
strength with which you press the keys. The
MU15 responds to both Channel (global) and
Polyphonic (individual keys) Aftertouch.
These messages let you delve even deeper into
the inner workings of the MU15, letting you
control the master volume and tuning, Sound
Module mode (XG or TG300B), Part param-
eters, effect types and parameters, and various
other settings.
One of the best and easiest ways to use System
Exclusive messages is with Yamaha's XGworks
software. The included XG Editor window lets
you view and edit all of the MU15 parameters
from your computer. Special "Detail" buttons
on the main window give you comprehensive
control over the Parts, Drum Setups, and effects.
The changes you make are instantaneous, and
you can save all your custom settings for future
recall as System Exclusive data, either directly
to the current song or as a special XG Parameter
file.
NOTE
Dec
Hex
Dec
Hex
Dec
0
32
00
16
10
1
01
17
11
33
2
02
18
12
34
3
03
19
13
35
4
04
20
14
36
5
05
21
15
37
06
38
6
22
16
7
23
17
07
39
8
08
24
18
40
09
9
25
19
41
10
0A
26
1A
42
11
0B
27
1B
43
12
0C
28
1C
44
13
0D
29
1D
45
14
0E
30
1E
46
15
0F
31
1F
47
Pitch Bend
Aftertouch
System Exclusive
The XG Editor in XGworks has additional parameters (for other
XG instruments) that are not available on the MU15.
Hex
Dec
Hex
Dec
Hex
Dec
20
80
48
30
64
40
21
65
81
49
31
41
42
82
22
50
32
66
23
51
33
67
83
43
24
52
34
68
44
84
25
53
35
69
45
85
26
70
86
54
36
46
27
71
47
87
55
37
28
56
38
72
48
88
57
39
73
49
29
89
2A
58
3A
4A
74
90
59
3B
75
4B
2B
91
2C
3C
76
60
4C
92
2D
77
93
61
3D
4D
62
78
4E
94
2E
3E
2F
63
3F
79
4F
95
Hex
Dec
Hex
Dec
Hex
50
96
60
112
70
113
51
97
61
71
98
114
72
52
62
53
63
115
99
73
54
100
64
116
74
101
65
75
55
117
56
66
76
102
118
57
103
67
119
77
58
104
68
120
78
121
59
105
69
79
5A
106
6A
122
7A
107
123
5B
6B
7B
108
124
5C
6C
7C
5D
109
125
6D
7D
110
5E
6E
126
7E
5F
111
6F
127
7F
91
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