Roland AT20s - Manual (Page 100)

100
Connecting with External Devices
If You’re Using MIDI
● What’s MIDI?
MIDI stands for “Musical Instrument Digital Interface,” and
is a unified standard for the exchange of performance data
and other information between electronic instruments and
computers.
The AT-20S is equipped with MIDI connectors and a
Computer connector to let it exchange performance infor-
mation with external devices. These connectors can be used
to connect the AT-20S to an external device for even greater
versatility.
● About MIDI Connectors
The AT-20S has two kinds of MIDI connectors.
Connecting these to the MIDI connectors on a MIDI
instrument makes it possible for the two instruments to
control each other.
For instance, you can output sound from the other
instrument or switch tones on the other instrument.
You should also set the MIDI send channel as needed.
❍ MIDI Out Connector
Only the notes played on the keyboard, movements of the
Damper pedal, Expression data, and data indicating that a
Registration button [1]–[4] was pressed will be transmitted to
the external MIDI connector.
❍ MIDI In Connector
Performance messages from an external MIDI device are
received here.
These incoming messages may instruct the receiving MIDI
instrument to play sounds or switch tones.
The AT-20S contains two sound generators: one sound
generator for its own keyboards and one GS sound generator
(p. 113). Normally, musical data transmitted from an external
device to the MIDI In connector is sent to the GS sound
generator, but you can also set the “MIDI IN Mode”
parameter (p. 96) so that the keyboard sound generator is
controlled.
■ Connecting the AT-20S to a
MIDI Instrument
1. Turn off the AT-20S.
2. Set the Computer switch on the bottom of the
AT-20S to “MIDI.”
* When the AT-20S is powered up, the setting doesn’t change
until the power is reset, even if the computer switch is operated.
3. Use a MIDI cable (sold separately) to connect
the MIDI connector on the external instrument
to the MIDI connector on the AT-20S.
4. Turn on the external MIDI device and AT-20S.
5. You should change the setting of TxMIDI chan-
nel as needed.
Connection Example:
❍ Connecting the MIDI Device
984
* A separate publication titled “MIDI Implementation” is also
available. It provides complete details concerning the way MIDI
has been implemented on this unit. If you should require this
publication (such as when you intend to carry out byte-level
programming), please contact the nearest Roland Service Center
or authorized Roland distributor.
Computer
PC-1
Mac
PC-2 MIDI
Out In
MIDI
AT-20S
External MIDI Devices
Pedal
Computer
PC-1
Mac
PC-2 MIDI
Out In
MIDI
L (mono) R
Output
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