Yamaha PSR-330 - Manual (Page 68)

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MIDI Functions
MIDI, the Musical Instrument Digital Interface, is a world-standard communication interface
that allows MIDI-compatible musical instruments and equipment to share musical informa-
tion and control one another. This makes it possible to create “systems” of MIDI instruments
and equipment that offer far greater versatility and control than is available with isolated
instruments.
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The MIDI Connectors
The MIDI IN connector receives MIDI data from an external MIDI device which
can be used to control the PSR-330. The MIDI OUT connector transmits MIDI data
generated by the PSR-330 (e.g. note and velocity data produced by playing the
keyboard).
IN MIDI OUT
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Simple MIDI Control
Most MIDI keyboards (including the PSR-330, of course) transmit note and
velocity (touch response) information via the MIDI OUT connector whenever a note
is played on the keyboard. If the MIDI OUT connector is connected to the MIDI IN
connector of a second keyboard (synthesizer, etc.) or a tone generator (essentially a
synthesizer with no keyboard), the second keyboard or tone generator will respond
precisely to notes played on the original transmitting keyboard. The result is that you
can effectively play two instruments at once, providing thick multi-instrument sounds.
The PSR-330 also transmits “program change” data when one of its voices is selected.
Depending on how the receiving device is set up, the corresponding voice will be
automatically selected on the receiving keyboard or tone generator whenever a voice
is selected on the PSR-330.
The PSR-330 is capable of receiving the same MIDI data, so a second MIDI
keyboard connected to the PSR-330 MIDI IN connector can be used to remotely play
the PSR-330 and select voices as required.
MIDI IN MIDI OUT PSR-330
MIDI OUT MIDI IN PSR-330
Tone Generator
MIDI Keyboard