Roland JV-1000 Introductory Manual page 80

4.
Sequencer
editing function
4.
Various types
of
MIDI
message
There
are various types of
MIDI
messages, and
the JV-1000's
sequencer
is
able
to
handle them
all.
Each message
includes a
"status" byte that
tells
what
type
of
message
it is.
Following
is
an explanation
of the
main
types
of
MIDI
message.
»
Note messages (NOTE)
These messages convey
musical
data.
When
you
play a note
on
a
MIDI
keyboard
instrument, a
note
message
is
transmitted indicating which
note (Note Number) was
played (Note
On
status)
and
how
strongly
(Velocity).
When
you
release the note, a
similar
message
is
transmitted indicating
that a note
was
released (Note Off
status).
When
a
sound
source
receives such messages,
it
responds by producing
sound
at the
appropriate
pitch indicated
by
the note number,
with higher note numbers
resulting
in
higher
pitches.
A
rhythm sound
source, however, would
receive such messages
and
play a
different
percussive sound
for
each
different
note number.
'
Program change
messages (PG)
Program change messages
instruct a
sound
source
to select a particular sound.
When
the
sequencer
transmits
a
program change
message,
the
internal
sound
source or an
external sound
source
will automatically
select
the specified sound.
External
effects
devices
that are
able to receive
MIDI
messages might
switch
to
a
new
set
of
effect
settings
in
response.
Pitch
bend
messages
(PB)
When
you
move
the pitch
bend
lever,
pitch
bend
messages
are transmitted to indicate
the
moment-by-moment
position of the
lever.
Usually
the
sound
source
will
smoothly
modify
the pitch
of
a
sound
in
response
to
these messages, but the actual
result will
depend on
the
settings of the
sound
source.
Pitch
is
lowered
Pitch
is
raised
Aftertouch messages
(CAf/PAf)
Some
synthesizers are able
to transmit aftertouch messages,
indicating
that further
pressure has been
applied
to
the
keyboard
after a
note has
been
pressed.
The
result of
receiving such
data
will
depend on
the
settings of the
sound
source.
Pressing more
strongly causes
greater effect (change)
There
are
two
types of aftertouch
messages: Channel
aftertouch
and Polyphonic
aftertouch.
Channel
aftertouch (CAf) applies
to
all
the notes receiving
a
given
MIDI
channel.