Glossary for Electronic Musical Instruments : Yamaha Manual Library

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.