Home : Tune Toys : Pieces-O-MIDI 
  This is the output of Pieces-O-MIDI on http://www.vgmusic.com/music/console/sega/master/DCrystal_Level1.mid

 
 
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Step 1 Select a MIDI file collection, from which a midi file will be automatically and randomly selected:
These parameters control how the file will be processed.
# of pieces: Offset: Multiplier:
Step 3

The algorithm for Pieces-O-MIDI is written in KeyKit, and here's the source code.