Roland U-20 Owner's Manual page 87

2.
MIDI Data Used by
the U-20
2.
MIDI Data
Used by
the U-20
MIDI
uses various types of
"message"
to transmit
data.
The
U-20
uses the following
types
of
MIDI
message.
Channel Voice
Messages
Note Data
Program Change
Control
Change
Pitch Bender
Aftertouch
System Messages
Exclusive Messages
etc.
Channel Voice
Messages
Channel
voice
messages
are
transmitted
and
received on a
specific
MIDI
channel.
These messages
include basic types of musical
data.
#Note
:
messages from
the keyboard
Note messages
tell
how
the keyboard
is
being played.
They
indicate
which key
(the
note number) was
played,
and
how
strongly
(the velocity).
Similar messages
are
transmitted
when
a
key
is
released.
For
the U-20's
Rhythm
Part and most
other
rhythm
machines, each note number
will
play
a different
rhythm
sound.
•Program Change
:
data that
selects
sounds
Program
change messages
are used mainly
to select
sounds.
The
U-20
uses
program
change messages
to
switch
Keyboard
Patches,
Sound
Patches, Timbres,
and
Rhythm
Setups. Devices
made by
different manufactiu-ers
will
respond
in different
ways
to
program
change
messages.
Check
the
manuals
for
your equipment.
•Control
Change
:
data
for
musical expression
Control
change messages
control musical expressions such
as vibrato, hold,
volume,
and
pan. In addition
to
its
bender
lever (modulation) and
hold
pedal, the
U-20 can transmit
control change messages
using three other
controllers
(EXT,
CI, C2). These
control
change messages can
control
not only Timbre and
Effect parameters
for the U-20's
own
internal sound
generator,
but can
also control
external
MIDI
devices. Devices
made
by
different manufacturers
may
transmit and
receive different
types
of control change
message, and respond
in different
ways
to these messages.
Consult the
MIDI
implementation
charts of your equipment
to see
which
control
change messages
are transmitted
and
received.