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Summary: MIDI duration is the setting of how long it takes a particular sound to die off. Create new music and edit digital sounds using tips on MIDI information from an experienced music engineer and producer in this free video.
"The next thing I'm going to show you about is about changing duration or different notes within your midi data. Within your midi data the ending of the notes if probably very important, depending on what you're playing. So, especially for drums, things like that, and playing different samples, you might want to cut them off at certain points, things like that. So what I'm going to do is I'm going to highlight my midi data, go into the midi tab and open up change duration. This will give me different options as far as the duration of my notes. Change my track view to notes so I can actually see the notes. And try messing with this a little bit. What I can do is do different things like randomize, or change different notes--I can also add things. I can scale--maybe by two hundred. Extend. Change smoothly. Maybe add a curve to it."
eHow Article: Pro Tools MIDI Duration Tips