#organ_stop__organstop  a graduated set of organ pipes of like tone quality
  supertype:  organ_pipe__organpipe__pipe__pipework  the flues and stops on a pipe organ
  subtype:  diapason_stop__diapason  either of the two main stops on a pipe organ
  subtype:  dulciana  the organ stop having a tone of soft sweet string quality
  subtype:  flue_stop  an organ stop with the tone of a flue pipe
  subtype:  reed_stop  an organ stop with the tone of a reed instrument
     subtype:  vox_humana__voxhumana  an organ reed stop producing tones imitative of the human voice
  subtype:  sourdine  an organ stop resulting in a soft muted sound
  subtype:  vox_angelica__voxangelica__voix_celeste  an organ stop producing a gentle tremolo effect

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