Roland E-80 Owner's Manual page 237

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The how-to's
MIDI is short for "Musical Instrument Digital Interface". The acronym refers to many things, the most obvious being
a connector type that is used by musical instruments and other devices to exchange messages relating to the act of
making music.
Transmits "MIDI IN" data
The E-80 receives data
External MIDI instrument/computer (*)
External MIDI instrument E-80
The E-80 transmits data
(*) MIDI communication via the USB port is also possible.