>   I'm seraching for a free of charge midi-specification. 

As Paul noted, the official spec only comes from the MMA, the 
closest you can get on-line is to look over these websites:

http://www.borg.com/~jglatt/tech/miditech.htm
http://www.hinton.demon.co.uk/midi/promidi.html

If you're only looking for the answer to a specific question,
you might find it at one of those URLs ...

                                                        --jl

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