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CalAr is a free graphic harmonic calculator software licensed under GNU GPLv3.
System requeriments: Java Runtime Environment 1.6 or above. Screen of at least 1024x600px. Optional: A Java Sound Bank.
The program allows you to select one of 108 notes from a keyboard indicating the harmonic quantity to consider (1-32). Then displays the frequency fot the fundamental and each harmonic, and shows the tuning error with a graphic indicator.