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Fix oversight which saw note tracking use pre-filtered pitches (resulting in many short notes)

 @article{emmanouil2012a,
  author = {Emmanouil Benetos and Dixon, Simon},
  title = {A Shift-Invariant Latent Variable Model for Automatic Music Transcription},
  journal = {Computer Music Journal},
  number = {4},
  pages = {81-94},
  volume = {36},
  year = {2012}
}