Counterpointer includes notation tools for entering and saving music and more than 150 user-controllable style rules. It offers

• Species counterpoint exercises based on the Fux examples (2, 3, and 4 parts)
  
• Species counterpoint exercises based on a cantus firmus invented by the computer - always new.
  
• Exercises in realizing Roman numerals in 4-part vocal harmony (harmony based on Bach examples)
  
• Exercises in realizing figured bass in 4-part vocal harmony (harmony and bass from Bach examples)
  
• Free counterpoint in 2-8 voices using your own choice of style rules
  
• An onscreen manual offering a basic introduction to counterpoint and explanations of each rule
  

Compositions can be saved, heard, printed, and exported as MIDI files. Counterpointer's student file is the same type as those used by Practica Musica: if you are already a Practica Musica student you can use the same student file to do work in Counterpointer, and your exercise scores will be added to those earned in Practica Musica.

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Counterpointer is now available on CD-ROM ($75) or as a downloadable installer ($65). Available for Windows 2000/XP/Vista, Macintosh 9.1-9.2, and Macintosh OS X (native).

Clicking a red box produces error explanations like those below: