-[Can I ask what you finally used to decipher it or was it all just trial
and error?]-
The best file format description I could find is at
http://www.opennet.ru/docs/formats/midi.txt

I also had to do quite a lot of looking at simple midi files with a hex
editor to clear up exactly how things are done in practise. One thing I
found that differs most file formats is that the number of 'ticks' per
crotchet varies depending on which program has saved the MIDI file: many
guides suggest that only one value, 96 is ever used here.

-[I've had ideas for a while about writing my own "Animusic"]-
Yes, I'd also like to do something of that sort. One thing which daunted me
slightly is the rendering time: it took 30 minutes to render that 6-second
xylophone animation (320x240 on a 1Ghz PIII), which corresponds to 10 hours
minimum for a 2 minute animation, and probably at least double this because
of the additional complexity of several instruments. I know this sort of
rendering time isn't unusual for Pov-Ray (c.f. Gilles Tran's 6-month render
of Cubicle Workers http://www.oyonale.com/ldc/english/cubicle.htm), but it
does make development quite a time-consuming process.

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