Links to SoundFonts and Midi information
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Here is a short set of links to specifications and information about the SoundFont format and the MIDI technology:
SoundFont specifications: version 2.01 and version 2.04. Also have a look at this short overview of the structure of a SoundFont.

To learn more about the MIDI technology, start by visiting the MIDI Manufacturers Association.

More MIDI specification documents are found here: jglatt, sbirch, the MIDI ArchiveSomascape, and AIBO.