MIDI voice 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.

Message MIDI device action
Note off A note should be released and should stop sounding
Note on A note should be played and should start sounding
Aftertouch / key pressure Pressure should be applied to a note, similarly to applying pressure to electronic keyboard keys
Controller A controller should be affected. A controller is a virtual slider, knob, or switch
Program change A program should be assigned to a MIDI channel. A program is virtual instrument, patch, or preset
Channel pressure Pressure should be applied to a MIDI channel, similarly to applying pressure to electronic keyboard keys
Pitch wheel / modulation wheel A channel pitch should be changed up or down

Other messages in the MIDI protocol include: 1) system common messages; 2) system real-time messages; and 3) meta messages.

See also:
Musical Instrument Digital Interface (MIDI)

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