MW 2000 Pro - FAQs
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Key change during the song - how to 
You can change the key during the song by placing your cursor at the beginning
of the bar you want to do the key change. Then click on Display>Bar. Choose 
your desired key. It will stay in that new key until you enter in another key 
change.

  See also: 
  Accidentals - Writing Notes w/ Sharps or Flats

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