Yamaha PSR-320 - Manual (Page 57)

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Overall Functions
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 information and control one another.
This makes it possible to create “systems” of MIDI instruments and equipment that offer far greater versatil-
ity and control than is available with isolated instruments.
● The MIDI Connectors
The MIDI IN connector receives MIDI data from an external MIDI de-
vice which can be used to control the PSR-320/420. The MIDI OUT
connector transmits MIDI data generated by the PSR-320/420 (e.g. note
and velocity data produced by playing the keyboard).
OUT IN
MIDI
● Simple MIDI Control
Most MIDI keyboards (including the PSR-320/420, of course) transmit
note and velocity (touch response) information via the MIDI OUT con-
nector 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-320/420 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-320/420.
PSR-320/420
Tone Generator
MIDI IN MIDI OUT