@related: [[non-free]] [[unlibre]]

  * http://www.xmlmind.com/foconverter/what_is_xfc.html xfc-22p1.tgz
  * http://createdigitalmusic.com/2010/04/02/of-midi-iphones-and-ipads-and-a-restrictive-future-for-hardware/?utm_s
  * http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=387926