(l
(4)
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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