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#C5 midi note number how to#
If an instrument receives two or more Note On messages with the same key number and MIDI channel, it must make a determination of how to handle the additional Note Ons. From the MIDI 1.0 Detailed Specification document version 4.2.1, PDF page 67 (printed page A-4): Here is what the MIDI spec has to say about this. The first and second measures show the two interpretations above.īecause of this ambiguity, I believe overlapping notes of the same channel and key are usually avoided in MIDI. The sequence could be interpreted two ways:ĭisplayed another way, imagine the following two staves are two voices on the same track and channel. For example, if you encounter the following sequence of messages on the same channel at beat intervals: However, when there are overlapping notes with the same channel and key, it is ambiguous which end goes with which start. It is possible to start another instance of a note with the same channel and key as a note that is already sounding, but each instance must eventually have a message that ends the note. In MIDI, each message that starts a note (a Note On message for a particular channel and key with non-zero velocity) must eventually be followed by a message that ends the same note (a Note On message for the same channel and key with zero velocity, or a Note Off message for the same channel and key with any velocity). (This MIDI file also contains a few notes that are 1 tick in duration - 1/960 of a second in this MIDI file, which seems unlikely to be how the pianist originally preformed them.) Technical Information Perhaps a glitch in the MIDI capture process didn't catch the correct release of those notes. It seems likely the overlapping notes are supposed to be separated and have a similar duration as the surrounding notes. In particular, the three notes mentioned in the question look like this in a sequencer: Starting another instance of a note with the same channel and key as a note that is already sounding is technically allowed in MIDI, but I believe it is not normal.