0.10
  fixed coordinates for GOP support
0.9
  added GOP support
0.8
  adapted for pd 0.37
0.7
  added "pitch x y" and "volume x y" messages
0.6
  added capability of saving and restoring patterns with "save" and "load" messages
0.5
  added init message
0.4
  fixed : last volume was not restored properly
0.3
  added the ability to be scanned backwards     
0.2
  added interpolation : getting values for non-integer input
  this enables glissando                                         
  fixed double-view pitches
0.1
  basic implementation of a sequencer's like pianoroll
