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Make coarse downsample factor a parameter; extend span out to the next coarse point in reference to avoid truncating the end a bit; slightly more helpful error messages

 @inproceedings{simon2005a,
  author = {Simon Dixon and Gerhard Widmer},
  title = {MATCH: A Music Alignment Tool Chest},
  booktitle = {Proceedings of the 6th International Conference on Music Information Retrieval (ISMIR-05)},
  year = {2005}
}