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Originally Posted by KuJi
lol... well they sound like the instruments of songs etc. =o
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A MIDI file is not an audio file as such; it is simply a file containing instructions for the computer to generate music with. For example, it might contain an instruction saying to play a note C on octave 3 using a piano sample, and then a A on octave 4 using the same piano sample.
The computer then goes through each instruction and constructs the audio on-the-fly. The same protocol is used for connecting keyboards to computers and other audio devices; since you are only transmitting the instructions instead of the actual sounds, it makes it possible to synthesize new sounds, and it also means you are transferring only a very small amount of data.
It is really important to remember that a MIDI file will
not sound the same everywhere. It'll sound different on a PC than a Mac, it'll sound different on a MIDI-capable mobile phone, hell, it will even sound different between different synthesizers on the same platform.