Standard MIDI File. A file format For transferring data between sequencers and between Macs and PCs. Sequence data is stored on disk in one of three formats: Type 0 packages all data into a single track, regardless of the number of original tracks. Type 1 retains the track layout, although the tempo and time signature of all tracks will be those of track one. Type 2 is the same as Type 1, except that each track keeps its own tempo and time signature, but is seldom implemented. The files include information called meta events about such things as track and instrument names, copyright notice, tempo change, SMPTE timecode offset, lyrics and key and time signatures. The time between sequence events is encoded in delta time messages of between one and four bytes.

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