“time” tells us the waiting time between the last and current operation.“velocity” tells how fast to strike the key, the faster it is, the louder the sound is.We can refer to the map below for the corresponding key on piano keyboard to each midi note id. The standard midi supports 16 channels simultaneously. “channel” tells to which channel the sound is to be sent.“note_off” tells the key is to be released (velocity should always be set to 0).“note_on” tells the key is to be pressed (or released, if velocity=0).Let’s take a closer look at the third track (track 2). The second track (track 1) and the third track (track 2) contains similar information: a few meta messages, and the major part - what note to be played in what way at what time.
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