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Kinds
of
MIDI
Data.
MID!
can be used
to
send
many
kinds
of
messages
that
contain
instructions
and
information
to
be used by
tine
receiving syntliesizer
and/or
rhytlim macinines.
Tlie
main
kinds
of
MIDi data
are
described below.
CHANNEL
A^OICe
MESSAGES
Tliese
te!i
ttie
receiving synthesizer(s) wliich
sounds
to
use,
which
notes
to play,
and
when
to start
and
stop
playing
those
notes.
They
may
aiso include instructions
to
use portamento,
modulation,
and
other
effects,
aWOTE
DATA
This information includes the notes
to
be
piayed
and
when
to start
and
stop
playing
them.
NOTE
ON
EVENT:
This
tells
the receiving synth to
start
^
playing
a note
(equivalent to
depressing
a
key
on
the
keyboard).
NOTE OFF
EVENT:
This
teiis
the
receiving
synth
to
stop playing
a
note
(equivalent
to
releasing
the key
on
the keyboard).
The
NOTE DATA
above
aiso include the foiiowing
infor-
mation.
• NOTE NUMBER:
Every note
has a
number
(representing the
keys
on a
keyboard).
This
number
tells
the receiving synth
which
note
to
piay.
VELOCITY:
This
determines
how
loud the note
is
piayed. (Not
all
synths
can send
or receive
this
data;
however,
no problems
are created
by mixing
velocity
and
non-velocity sensitive keyboards.)
The
relationship
between
velocity
value
and
"volume"
is
shown
in
the
chart below.
J
Fig.
2
1
I—
#-
:^
p
-"P
64
-4—
127
-1
«/
/
M
M
7
MIDI
@
PROG RAM CHAN
G
ES
This
is
used
to select
the
sound program number
to
be
used. Therefore, the receiving
synth(s)
can be
made
to
change
its
sound
by
remote
control.
©CONTROL CHANGES
This
can be used
to
control pitch
bends, modulation,
sustain (damper),
portamento,
and
other
effects.
O
PITCH
BEND
This
is
used
to control pitch
bend
effect.
CHANNEL MODE MESSAGES
These
determine
the
channel
mode
used
for
communica-
tions.
O
OMNI
MODE
When
in
the
Omni
mode,
the
receiving
synths
will re-
spond
to
all
information regardless
of
which
channel
it
is
sent
on.
When
the
Omni mode
is
off,
a
synth
will re-
spond
only
to
data sent
on
its
particular specified
channel.
If
you
turn
off
the
Omni
mode,
then be sure
that
the
sending
synth
is
set to
the
same
channel
number
as
the
receiving synth.
Q
POLY
MODE/MONO MODE
This
determines whether
note data
will
be handled as
polyphonic
(chords) or
monophonic
(one note played
at
a
time).
In
the poly
mode,
the
receiving
synth
will,
of
course,
be
limited
by the
number
of
voices
that
it
has.
In
the
mono
mode,
only
one
note
will
be played
at
a
time,
even
if
receiving multiple
note
data.
Fig.
1
Note
number
in
piano range
63
66
68 70
73
75
80
82
85
87
90
92
91
97
99
102 104 106
35
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