There are different flavors of the general MIDI standard. Instruments that are certified to support General MIDI generally have a special logo indicating what level of General MIDI they support. General MIDI (GM) is a high-level standard that defines a common set of sounds, effects, and features that guarantee that a song composed for one GM-compatible instrument will sound more or less the same when played on another GM-compatible instrument, even if it was made by another manufacturer.Since these files are so rare there are almost no tools available that support them. (In fact I don't think I've ever seen one.) Type 2 files can contain multiple Type 1-style songs kind of like a self-contained MIDI playlist. Type 2 files are described by the MIDI standard, but they never caught on.Tracks can also be named, which many composers use to describe the musical role of each particular track. The order of these tracks in the file does not necessarily correspond to the MIDI channels of the data they contain (so, track 1 might have notes meant for MIDI channel 10). Type 1 files can include multiple "tracks" which are most commonly used to contain separate musical parts meant for different MIDI channels.These are the most common kind of MIDI file, and the most widely supported. If the file contains a multitimbral song with parts intended for multiple MIDI channels, all of this data is jumbled together in the same data segment, and it's up to the sequencer or instrument loading the file to route events to the right channels during playback. Type 0 files contain a single data segment that includes the entire contents of the file.There are different kinds of Standard MIDI files: One slightly confusing thing about Standard MIDI Files is that despite the SMF acronym, the files usually have a. Basically, whatever can travel down a MIDI cable can be stored in a Standard MIDI file, including not just note and program change data, but even proprietary SysEx data (like patch banks and firmware updates).
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