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MIDI messages which represent notes played on a keyboard or other instrument. Pressing a key produces a Note On message, and a Note Off message is produced when the key is released.
Note On message includes a specific note number which corresponds to the key which is pressed, plus a velocity value based on how hard the key is struck.
The Note Number range is 0 (C-2) ~ 127 (G8) and "middle C3" is 60. The Velocity range is 1~127.