MIDI voice messages

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The MIDI protocol consists of MIDI event that carry four types of messages: 1) voice messages; 2) system common messages; 3) system realtime messages; and 4) meta messages.

MIDI voice messages are those messages that are specific to a MIDI channel and directly affect the sound produced by MIDI devices.

MIDI voice messages include the following.


MessageMIDI device action
Note offA note should be released and should stop sounding
Note onA note should be played and should start sounding
Aftertouch / key pressurePressure should be applied to a note, similarly to applying pressure to electronic keyboard keys
ControllerA controller should be affected. A controller is a virtual slider, knob, or switch
Program changeA program should be assigned to a MIDI channel. A program is virtual instrument, patch, or preset
Channel pressurePressure should be applied to a MIDI channel, similarly to applying pressure to electronic keyboard keys
Pitch wheel / modulation wheelA channel pitch should be changed up or down

See also:
Musical Instrument Digital Interface (MIDI)



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