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If you investigate using something like Event List viewer or the like, you should find that the majority of MIDI files do not contain Note Off data, only Note On and then the Duration data. This is contained in one parcel and thus there is no need to send a separate Note Off and time, which is another line of data.


Well, the event list of sequencers in general don't show the raw MIDI commands of the file but just a compact and readable interpretation. But when looking directly at the MIDI file with a MIDI-to-Text converter you'll see the original Note Off commands (usually Note On with velocity 0).