Korg iS35, Руководство пользователя

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Getting Started• MIDI
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6. MIDI
What is MIDI?
The MIDI protocol.
MIDI is a standard protocol that
defines the communication hardware and software
between musical instruments and between musical
instruments and computers. The hardware is repre-
sented by the interface with multipolar connectors
located on the back of the iS35. The following connec-
tors are present:
• MIDI IN (to receive data),
• MIDI OUT (to send data)
• MIDI THRU (to re-transmit the data received over
the MIDI IN).
The MIDI IN 1 and MIDI IN 2 connectors of the iS35
are equivalent. The signals received over these connec-
tors are joined in the iS35. As a rule, use the MIDI IN1
connector if only one instrument is connected.
The software of the MIDI protocol is represented by a
series of “messages” that the controller instrument
(master) sends to the controlled instrument (slave) to
“instruct” it to emit a sound or somehow modify it.
For instance, if the iS35 is connected to a master key-
board, the pressing of a key on the master keyboard
will cause the transmission of a note activation mes-
sage (Note On). The message goes through one of the
MIDI channels and reaches the iS35 that converts the
note message in a sound.
The same occurs with other messages: for example,
pressing the sustain pedal will cause the transmission
of the Sustain/Damper message; editing the volume
will cause the transmission of the Volume message,
and so on.
The MIDI messages.
There are “general” MIDI mes-
sages (metronome tempo, Start/Stop, Local Off) and
“channel” messages that only refer to one of the six-
teen MIDI channels.
The channel messages include the Note On (note acti-
vation), Program Change (selection of program,
arrangement, Keyboard Set), and Control Change.
Most of the control messages, such as Sustain/Damper
and Volume, is sent in the form of a Control Change
message. This message consists in two parts: the Con-
trol Change number (0-127), that determines the con-
trol type, and the control value (0-127).
For instance, the activation of the Sustain/Damper
pedal is a Control Change #64, with value 127. A
“standard” volume is a Control Change #07, with
value 90.
Some important controllers are:
The list of the messages sent via MIDI can be found in
the Appendix.
Connections.
In order to connect two musical instru-
ments, you need standard MIDI cables that can be
found in any musical instrument store.
Each cable must be used to connect two connectors of
different instruments. Never connect two connectors
of the same instrument with the same cable.
The simplest connection is the connection between the
MIDI OUT connector of the controller and the MIDI
IN connector of the controlled instrument.
The MIDI channels.
The MIDI messages are sent from
one instrument to the other over 16 separate channels.
Each message must be sent over a specific MIDI chan-
nel.
For example, if the keyboard transmits over channel 1,
the controlled instrument must receive over channel 1.
If not, the controlled instrument will not play or will
play the sound of a different channel.
The special channels.
Some MIDI channels of the
iS35 can be assigned to “special channels” that are
used for special functions. These channels are Global,
Chord 1, Chord 2, Arrangement and Keyboard Set. A
CC# Name Notes
00 Bank Select MSB
In combination with CC#32 selects
the program bank. In the iS35 its
value is always 0.
01 Modulation Activates modulation.
07 Volume Selects volume.
10 Pan Selects the pan value.
32 Bank Select LSB
In combination with CC#00, selects
the program bank. In the iS35 the
possible values are:
Banks A-B = 00
Banks C-D = 01
Bank E = 02
Bank F = 03
Bank Dr = 04
91 Effect 1 send Effect 1 send
93 Effect 2 send Effect 2 send