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On a TV, you switch channels to watch
Station A
the station (program) you want.
i
[seme
a
The cable coming from
the antenna carries the
TV signals for a variety
of broadcasts.
MIDI uses sixteen channels (1-16), and MIDI messages will
be received by the instrument (the receiving device) whose
channel matches the channel of the transmitter.
* {f Omni mode is on, data of all MiDI channels will be received
regardless of the MIDI channel setting. If you do not need to
control a specific MIDI channel, you may use Omni On.
2. Main types of MIDI message
used by the SX-700
MIDI includes many types of messages that can convey a
variety of information. MIDI messages can be broadly di-
vided into two types; messages that are handled separately by
a MIDI channel (channel messages), and messages that are
handled without reference to a particular MIDI channel
(system messages).
< Channel Messages >
These messages are used to convey performance informa-
tion. Normally these messages perform most of the control.
The way in which a receiving device will react to each type
of MIDI message will be determined by the settings (and
design) of the receiving device.
Program Change messages
These messages are generally used to select sounds, and
include a Program number from 1 to 128 which specifies the
desired sound.
Control Change messages
These messages are used to enhance the expressiveness of a
performance. Each message includes a controller number,
and the settings of the receiving device will determine what
aspect of the sound will be affected by Control Change
messages of a given control number.
The specified parameters can be controlled with the SX-700.
Aftertouch Messages
These messages convey the ongoing changes in the value of
'Aftertouch.' They contain information about the amount of
pressure applied to keys on a keyboard, and usually are used
to cause a change in the nuance of the sound (vibrato or
modulation, for example). There are two types of Aftertouch;
Channel and Polyphonic.
Channel Aftertouch provides control based on individual
MIDI channels. No matter which specific keys are pressed
more firmly, the effect is applied equally to all notes on the
same MIDI channel.
Polyphonic Aftertouch provides control on an individual key
(note) basis. Even though it may share the same MIDI channel
with other notes, any particular key that has more pressure
put on it will produce a unique effect.
The SX-700 responds to Channel Aftertouch messages which
can be assigned to control a selected parameter.
Pitch Bend Messages
These messages convey the action of a Pitch Bend Lever
(Wheel) that is found on many synthesizers. On the SX-700,
these messages can be used to control selected parameters.
Note Messages
Note messages convey the musical notes played during a
performance. On the SX-700, Note On/Off messages (press/
release of keys) for specific Note Numbers (position on the
keyboard), as well as Velocity messages (force applied when
pressing a key) can be used to control selected parameters.
< System Messages >
System messages include exclusive messages, messages used
for synchronization, and messages used to keep the MIDI
system running correctly. Exclusive messages are the main
type of message in this category used by the SX-700.
Exclusive Messages
Exclusive messages handle information related to a unit's
own unique sounds, or other device-specific information.
Generally, such messages can only be exchanged between
devices of the same model by the same manufacturer.
Exclusive messages can be employed to save the settings for
Effects Programs into a sequencer, or for transferring such
data to another SX-700.
The two instruments must be set to the same device ID
numbers when exchanging SysEx messages.
54
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