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Original file (1,000 × 825 pixels, file size: 517 KB, MIME type: application/pdf, 27 pages) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
If a MIDI file is programmed to the General MIDI protocol, then the results are predictable, but timbre and sound fidelity may vary depending on the quality of the GM synthesizer. The General MIDI standard includes 47 percussive sounds, using note numbers 35-81 (of the possible 128 numbers from 0–127), as follows: [3]
MIDI files contain sound events such as a finger striking a key, which can be visualized using software such as Synthesia. A MIDI file is not an audio recording. Rather, it is a set of instructions – for example, for pitch or tempo – and can use a thousand times less disk space than the equivalent recorded audio.
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MIDI files, though, are not capable of storing engraving information (how the notes were laid out) or enharmonic spelling. If the music scores are recognized with the goal of human readability (referred to as reprintability), the structured encoding has to be recovered, which includes precise information on the layout and engraving.
It is possible to play MIDI files on Wikipedia, but rather than relying on the user's browser and operating system to support MIDI files, it relies on an extension that internally converts the MIDI instructions into a digital audio file that is playable on most browsers, and displays an audio player.
MIDI files do not contain any sounds, only instructions to play them. To play such files, sample-based MIDI synthesizers use recordings of instruments and sounds stored in a file or ROM chip. SoundFont-compatible synthesizers allow users to use SoundFont banks with custom samples to play their music.